Assistant Commissioning Project Manager, HV SOLV Energy LLCAssistant Commissioning Project Manager, HVCA$92,091–$115,114 / yearJob Description Summary: The Assistant Commissioning Manager supports the planning, execution, and oversight of testing and commissioning activities for SOLV Energy's High Voltage (HV), Battery Energy Storage Systems (BESS), and Photovoltaic (PV) projects. In addition, candidate introductions or resumes can only be submitted to our internal talent acquisition recruiting team if a signed vendor agreement is already on file and the third-party recruiter or agency has received formal instructions from our internal talent acquisition team to submit candidates for a particular job posting.
Assistant Commissioning Project Manager, PV SOLV Energy LLCAssistant Commissioning Project Manager, PVCA$92,091–$115,114 / yearJob Description Summary: The Assistant Commissioning Manager supports the planning, execution, and oversight of testing and commissioning activities for SOLV Energy's High‑Voltage (HV), Battery Energy Storage Systems (BESS), and Photovoltaic (PV) projects. In addition, candidate introductions or resumes can only be submitted to our internal talent acquisition recruiting team if a signed vendor agreement is already on file and the third-party recruiter or agency has received formal instructions from our internal talent acquisition team to submit candidates for a particular job posting.
Assistant Commissioning Project Manager, BESS SOLV Energy LLCAssistant Commissioning Project Manager, BESSCA$92,091–$115,114 / yearJob Description Summary: The Assistant Commissioning Manager supports the planning, execution, and oversight of testing and commissioning activities for SOLV Energy's High‑Voltage (HV), Battery Energy Storage Systems (BESS), and Photovoltaic (PV) projects. In addition, candidate introductions or resumes can only be submitted to our internal talent acquisition recruiting team if a signed vendor agreement is already on file and the third-party recruiter or agency has received formal instructions from our internal talent acquisition team to submit candidates for a particular job posting.
Project Manager Construction BrightView LandscapesProject Manager ConstructionSanta Ana, CA$90,000–$110,000 / yearFull timeServing as the main point of contact and trusted advisor to customer on project installation issues; Gathering and analyzing customer needs and interests; building strong business relationships and providing solutions to challenges; Providing customers with clear and easy to understand information pertaining to all of our high quality products and services. Managing cost reports, analyzing budget variances and recommending strategies to lower project costs; reviewing labor quantities and phases to facilitate accurate project tracking.
Web Project Mgr. - Japanese Bilingual A-STAFFING, INC.Web Project Mgr. - Japanese BilingualTorrance, CaliforniaYou will accompany the sales team to initial client consultations, craft digital marketing plans, oversee site construction timelines, manage advertising campaigns, perform web analytics, and deliver continuous post-launch optimization—driving the entire project lifecycle forward. One-Stop Strategic Impact: This position offers the unique opportunity to manage projects comprehensively from strategy formulation to site launch, advertising operation, analytics, and ongoing PDCA cycles.
Project Manager AGI General ContractingProject ManagerSanta Ana, CA$110,000–$160,000 / yearAbout Us: AGI General Contracting (AGI) is a commercial general contracting firm that was founded in 1978 and has successfully completed projects in a wide range of industries, from grocery stores and retail developments to medical facilities, restaurants, and theme parks. The Project Manager manages all aspects of the project management and administrative policies, procedures, and functions, including but not limited to: Developing high-performance project teams through supervision, training, coaching, and mentoring members of the team.
Project Manager Crown Technical SystemsProject ManagerFontana, CaliforniaCrown Technical Systems, a Flex Company, is a leader in power distribution and protection systems concentrating on sophisticated, state-of-the-art relay and control panels, medium voltage switchgear, and enclosures (power/control buildings/ E-Houses). Review project scope and develop a project schedule to establish action items and scheduled dates for each action item; communicate schedule with internal departments including engineering, purchasing, production, inventory, and quality control.
Project Manager Flatiron Construction CorpProject ManagerLos Angeles, CAMaintains strong working relationships with Flatiron supporting departments and the project owner to support the project work plan and payment schedule. Serves as the main point of contact for all third-party stakeholders, including landowners, local business owners, and government agencies involved in the project.
Project Manager Healthcare Clayco IncProject Manager HealthcareLos Angeles, CA$90,000–$133,000 / yearWith $5.8 billion in revenue for 2023, Clayco specializes in the ''art and science of building,'' providing fast track, efficient solutions for industrial, commercial, institutional, and residential related building projects. Clayco is a full-service, turnkey real estate development, master planning, architecture, engineering, and construction firm that safely delivers clients across North America the highest quality solutions on time, on budget, and above and beyond expectations.
Project Manager Iconma LLCProject ManagerCAConducts project closure activities to formalize and communicate the project acceptance, handover documentation and ongoing activities to accountable teams and complete a post-implementation review to identify areas of improvement. Manages project initiation activities including identifying contractual obligations, client needs and goals, existing situation, necessary contacts and access to existing information as needed.
Project Manager, Customer Facing, Spectrum Business Charter Communications IncProject Manager, Customer Facing, Spectrum BusinessCerritos, CA$68,300–$157,200 / yearBeyond our connectivity solutions, we also provide local news, programming and regional sports via Spectrum Networks and multiscreen advertising solutions via Spectrum Reach. Get to Know Us Charter Communications provides superior communication and entertainment products for residential and business customers through the Spectrum brand.
Project Manager II Perkins EastmanProject Manager IIIrvine, CA$105,000–$124,000 / yearWe are seeking an individual with strong technical and communication skills working within the design team to create exemplary buildings, specifically public schools and government projects to suit clients' and users' needs. The Opportunity: Project Manager is a project leadership position with responsibility for quality of services, architectural design, technical production of projects, client management and financial management.
Senior Project Manager (Heavy Civils) Centex ConstructionSenior Project Manager (Heavy Civils)Long Beach, CA$190,000–$225,000 / yearIn the pursuit phase, the PM serves as the Operations Lead, working closely with the Strategic Pursuit Lead, Estimating, Proposal/Marketing, and Design Partners to evaluate project risks, develop technical approaches, propose Alternative Technical Concepts (ATCs), conduct value engineering, and shape construction execution plans. The ideal candidate will manage alternative delivery projects (CMAR, CMGC, Progressive DB, Design-Build) by leading operational assessments, technical development, and constructability strategies during the pursuit and preconstruction phases, then transitioning into project execution during construction.
Project Manager Liquid I.V.Project ManagerEl Segundo, California$124,000–$148,000 / yearWe know that the happiest and highest performing teams include people with diverse perspectives that encourage new ways of solving problems, so we strive to attract and develop talent from all backgrounds and create workplaces where everyone feels seen, heard, and empowered to bring their full, authentic selves to work. Development and management of projects including scoping, establishing timelines, milestones and deliverables, meetings and stage gate progression, influencing and driving accountability and results including OTIF execution.
Project Manager - Turnbull OHL USA IncProject Manager - TurnbullCA$150,000–$180,000 / yearMaintains ongoing communication with client, making adjustments as necessary to comply with clients' needs within contractual obligations, or just adjusting project deliverables to meet the client and stakeholders needs. OHLA Human Resources is the only authorized representative of OHLA to execute any agreements with search firms or staffing agencies.
Project Manager - Turnbull OHLA USAProject Manager - TurnbullCity of Industry, California$150,000–$180,000 / yearMaintains ongoing communication with client, making adjustments as necessary to comply with clients’ needs within contractual obligations, or just adjusting project deliverables to meet the client and stakeholders needs. OHLA Human Resources is the only authorized representative of OHLA to execute any agreements with search firms or staffing agencies.
NewBusiness Process Analyst - Local Candidates Only MSIBusiness Process Analyst - Local Candidates OnlyOrange, CA$71,000–$85,000MSI's product line includes an extensive offering of Granite , Quartz , Porcelain , Luxury Vinyl flooring , Slate , Marble , Travertine , Sandstone , Limestone , Quartzite , onyx , stacked stone and pavers imported from over 36 countries on six continents. The Business Process Analyst works with a team of highly skilled associates and managers to manage projects including: client integration, new business transition as well as implementing new services and programs internally.
Project Manager: application projects KORE1 TechnologiesProject Manager: application projectsOrange, CA$50–$65 / hourThe ideal candidate will be responsible for managing and delivering one, or multiple projects focused on development and integration of functional system components by collaborating with the program workstream leads, other program team members (including from our third-party solution vendor) and stakeholders across the company, to ensure that all activities are accounted for and monitored proactively. This individual will be responsible for developing and monitoring the project schedule and scope, facilitating communication among workstream teams and other stakeholders, and monitoring and driving to conclusion the actions items, issues, risks and decisions related to the project.
Construction Project Manager PIC Group IncConstruction Project ManagerLos Angeles, CA$70–$80 / hourThe Construction Project Manager will oversee contractor execution, monitor schedule performance, manage project scope and field changes, and help drive successful project delivery while maintaining compliance with safety, quality, and project requirements. Job Summary: NAES is seeking an experienced Construction Project Manager to support a large-scale mechanical construction project in Los Angeles, CA.
Senior Technical Project Manager, HRIS | Contract Mindbody IncSenior Technical Project Manager, HRIS | ContractCA$41.57–$55.43 / hourIf you are a California resident or reside outside the United States then by submitting your application you confirm that you have read, understood, agree and - where applicable - grant your prior, free, informed and express consent for the processing of your personal information, including sensitive personal information, as described in our California Applicant Privacy Notice or International Applicant Privacy Notice (as applicable). Youll partner closely with HR, Payroll, IT, and Finance to keep workstreams aligned, risks surfaced early, and execution moving, while ensuring the transition feels organized, human, and connected to the employee experience throughout.
Technical Project Manager Gainsight, Inc.Technical Project ManagerCA$71,000–$91,200 / yearThis is a great opportunity for someone who thrives in a fast-paced, client-facing environment and enjoys working cross-functionally with teams like Sales, Customer Success, Product, and Engineering. What You'll Do: Execute complex software implementation projects while partnering closely with executive-level client sponsors to ensure alignment on scope, timeline, and desired business outcomes.
TikTok Shop - Procurement Project Manager (FBT Operations) TikTok IncTikTok Shop - Procurement Project Manager (FBT Operations)Fontana, CAThe ideal candidate has hands-on warehouse operations experience, understands warehouse equipment and infrastructure, and is comfortable leading cross-functional projects across Operations, Procurement team, Planning team. Team Overview TikTok Shop's Supply Chain & Logistics' mission is to improve delivery experience while minimizing costs from Fulfillment by TikTok (FBT) via seamless integrated FBT product solution and operation.
Geotechnical Sr Project Manager TechoundsllcGeotechnical Sr Project ManagerAliso Viejo, CaliforniaUnderstanding of engineering science and technology, design techniques, tools, and principals involved in production of precision technical plans, blueprints, drawings, and models. Responsibilities include estimating, contract negotiations, budget development, managing construction, scheduling, cost control, quality control, and client relations.
Project Manager Uprite ConstructionProject ManagerIrvine, CaliforniaUprite Construction was established in 1991 as a multi-service construction company specializing in project site development, ground-up, new construction, renovations, and tenant improvements for the commercial and industrial sectors. We are seeking an experienced Project Manager to lead complex projects from preconstruction through closeout while maintaining our commitment to safety, quality, client satisfaction, and operational excellence.
Capital Construction Project Manager University of Southern CaliforniaCapital Construction Project ManagerLos Angeles, CA$118,626.09–$134,724.60 / yearWhen extending an offer of employment, the University of Southern California considers factors such as (but not limited to) the scope and responsibilities of the position, the candidate's work experience, education/training, key skills, internal peer equity, federal, state and local laws, contractual stipulations, grant funding, as well as external market and organizational considerations. FPM (formerly named Capital Construction & Development / Facilities Management Services) is responsible for planning, developing, and maintaining the breadth of the facilities at USC, and is also dedicated to creating a safe environment for our USC community.
Project Manager Crane CompanyProject ManagerBurbank, CaliforniaProject Management responsibilities extend from a range of business needs, included but not limited to; strategic sourcing and supplier transitions, design to cost activities, productivity improvements, operational excellence projects, new product integration, quality improvements, and continuous improvement (CBS) projects. The Project Manager provides project focused leadership and management of cross functional Business, Engineering, Quality, Supply Chain, and Operations teams while assuming accountability for overall success of assigned projects.
Project Manager - Ambulatory Operations Improvement - Full Time 8 Hour Days (Exempt)(Non-Union) University of Southern California- HSProject Manager - Ambulatory Operations Improvement - Full Time 8 Hour Days (Exempt)(Non-Union)Los Angeles, California$84,365–$138,330 / yearCommunication and Interpersonal Skills: Work closely with acquired or partnered or affiliated hospitals, ambulatory facilities and physician practices to expand existing Keck Medicine clinical programs, develop new clinical programs as needed and facilitate integrated multidisciplinary programs across the Keck Medicine provider network Develop and maintain effective relations with widely diverse groups such as staff members, faculty and executive leaders on a variety of complex issues and administrative tasks. Track project performance, specifically to analyze the successful completion of short- and long-term goals Delegate project tasks based on junior staff members’ individual strengths, skill sets and experience levels Develop comprehensive project plans to be shared with clients as well as other staff members.
NewIT Project Manager Stellant SystemsIT Project ManagerTorrance, California$105,000–$140,000 / yearFull timeThis position will coordinate cross-functional teams, business stakeholders, consultants, and vendors to deliver projects within the approved scope, schedule, and budget. The IT Project Manager will plan and manage projects across IT Infrastructure, Enterprise Applications, and Business Intelligence.
Project Engineering Manager - Substation 1 Black & Veatch Holding CoProject Engineering Manager - Substation 1Irvine, CA$125,879–$237,640 / yearOur Technology, Commercial & Industrial Team has specialized capabilities focused on the latest needs for clients in a fast-growth technology-led arena of advanced manufacturing, and generative AI computing including gigafactories, bio/ag tech, data centers and distributed infrastructure. Experience in design of substation facilities with strong understanding of overall project lifecycle, layout design and optimization, relay protection & control, civil/structural designs, and technical knowledge of major equipment associated with substation facilities.
Project/Program Manager EsselProject/Program ManagerSanta Fe Springs, CAYOU ARE AN EXCELLENT COMMUNICATOR that effectively communicates in a clear and direct manner using easily understood language with the Engineering teams, Sales team, Purchasing team, Clients, and Vendors. The Project Manager will lead multiple projects in design, engineering, and fabrication of custom process systems for a diverse range of industries, including defense/aerospace, electronics, chemical, energy, and more.
NewConstruction Project Manager True ReligionConstruction Project ManagerEl Segundo, CA$100,000–$145,000 / yearTHE PURPOSE: The Construction Project Manager is responsible for bringing True Religion's physical retail experience to life by leading the successful execution of store development projects across the portfolio. THE ROLE (what you are accountable for): Manage all phases of retail construction projects, including new store openings, remodels, relocations, and special projects from planning through turnover.
Substation Project Manager - Grid Michael Page InternationalSubstation Project Manager - GridIrvine, California$75–$95 / hourTemporaryContact Dom Delia Quote job ref JN-062026-7042980Job SummarySectorPower & EnergySub SectorProject ManagerIndustryEnergy & Natural ResourcesWhereIrvineContract TypeTemporaryConsultant NameDom DeliaJob ReferenceJN-062026-7042980Job NatureHybrid working FE, PE license preferred, PMP in lieu of PE.Experience with or exposure to system projection and planning, communication, distribution, and transmission lines as well as public involvement, environmental permitting, and real estate acquisition are an added benefit.
Environmental Project Manager EFI GlobalEnvironmental Project ManagerLos Angeles, CA$72,000–$100,000 / yearOver the last four decades, we have grown from a boutique firm specializing in handling insurance fraud and arson cases and providing expert witness testimony, into a recognized global leader in engineering failure analysis, origin-and-cause investigations, environmental consulting, laboratory testing and specialty consulting. Mental: Clear and conceptual thinking ability; excellent judgment, troubleshooting, problem solving, analysis, and discretion; ability to handle work-related stress; ability to handle multiple priorities simultaneously; and ability to meet deadlines.
NewSenior Project Manager - Electric Transmission - California (Remote within CA) Tetra Tech IncSenior Project Manager - Electric Transmission - California (Remote within CA)Irvine, CARemote$140,000–$180,000 / yearPay Range - There are multiple factors that are considered in determining final pay for a position, including, but not limited to, relevant work experience and demonstrated work experience in the above role; skills, certifications, and competencies that align to the specified role; geographic location; and education, as well as contract provisions regarding labor categories that are specific to the position. With 30,000 employees working together, Tetra Tech provides clear solutions to complex problems by Leading with Science to address the entire water cycle, protect and restore the environment, design sustainable and resilient infrastructure, and support the clean energy transition.
Senior Project Manager - Enterprise Asset Management System (EAMS) Stand 8Senior Project Manager - Enterprise Asset Management System (EAMS)Long Beach, CaliforniaThe Senior Project Manager will manage risks, coordinate dependencies across multiple vendors and internal teams, and ensure activities such as testing, validation, and governance are executed to support asset lifecycle goals. STAND 8 provides end to end IT solutions to enterprise partners across the United States and with offices in Los Angeles, New York, New Jersey, Atlanta, and more including internationally in Mexico and India.
Project Development Manager MAAS CompaniesProject Development ManagerLos Angeles, CaliforniaAs a Project Development Manager, you run that front end: you plan and coordinate the pre-construction work for new school and modernization projects, own the scope, schedule, and budget across multiple projects at once, and carry each one through planning, design, and into construction. You resolve the complex planning, design, and construction issues that stall projects, review architect and engineer contract scopes, fees, and payment applications, and manage the overall finances of your projects.
FAC PROJECT MGR 2 The Regents of the University of California on behalf of their Los Angeles CampusFAC PROJECT MGR 2Los Angeles, California$5–$10 / hourFull timeES&BC manages three functional areas: Energy Services, DDC/Building Controls, and Purchased Utilities, encompassing cogeneration plant operations, LED and ECP capital programs, utility metering and billing, steam and chilled water distribution, and building automation system oversight. Reporting directly to the Director of ES&BC, the incumbent is responsible for cross-functional coordination, capital program execution tracking, and departmental operational integration across plant operations, building automation, utility financial management, and campus decarbonization initiatives.
Senior Project Manager Vista Group International LtdSenior Project ManagerLos Angeles, CAThis may include but is not limited to; building Statements of Work, managing risks, tracking change control, and coordinating with the project team to successfully execute the project to success. Monitor and track time spent on projects and helps to report on various KPIs, completion of tasks by due date, budgets, rework rates, actuals vs.
Senior MEP Project Manager UNAVAILABLESenior MEP Project ManagerLos Angeles, CASuffolk – America’s Contractor – is a national company with more than $9 billion in annual revenue, 3,000 employees, and 17 offices, including Boston (headquarters), New York City, Miami, West Palm Beach, Tampa, Estero, Dallas, Los Angeles, San Francisco, San Diego, Las Vegas, Herndon, U.S. Virgin Islands, and other key markets. This includes the selection and management of MEP subcontractors, and the review, management, and administration of mechanical bid tabs/Exhibit Bs, MEP submittals, monthly MEP requisitions and change orders, and MEP contractor schedule/performance.
Project Manager - M&O The Tsui GroupProject Manager - M&OLos Angeles, CA$131,000–$136,000 / yearThe Tsui Group is seeking a candidate who is qualified and experienced in educational facility construction projects to serve as a Project Manager - M&O for a large educational client within Los Angeles County with the below duties: Manages, oversees and coordinates all facets of the pre-construction, bid and award, construction and close-out phase of all assigned projects. Minimum of 8 years of full time professional experience in the Project/Construction Management of Commercial and/or Public/Educational Facility Construction with full responsibility for coordinating complex projects with construction values up to $2M or more.
Commercial Project Manager - General Contractor AlphaHireCommercial Project Manager - General ContractorGlendale, CaliforniaThis role requires full ownership of projects from preconstruction through closeout, including budgeting, scheduling, subcontractor management, and client coordination. The ideal candidate has experience operating in Southern California and understands local permitting, inspections, and jurisdictional requirements.
Commercial Project Manager - General Contractor (Ground-Up & TI) AlphaHireCommercial Project Manager - General Contractor (Ground-Up & TI)Long Beach, CaliforniaWe are seeking a Senior Commercial Project Manager with proven General Contractor experience to lead ground-up and tenant improvement (TI) projects across the Los Angeles market. This role requires full ownership of projects from preconstruction through closeout, including budgeting, scheduling, subcontractor management, and client coordination.
NewMICE Global Sales & Project Manager - Florida, Texas & California Melia Hotels International SAMICE Global Sales & Project Manager - Florida, Texas & CaliforniaCalifornia, CAPromote Meliá Hotels International's global portfolio to meeting planners, sourcing managers, incentive houses, and key decision-makers to generate new RFP opportunities and increase group booking conversion. Coordinate and execute hospitality-focused events including roadshows, networking events, familiarization trips, site inspections, incentive experiences, and Meliá Signature Experiences throughout the year.
Architectural Junior Project Manager MG2 CorpArchitectural Junior Project ManagerIrvine, CA$75,000–$90,000 / yearYou will be working in our Client Programs (CP) Market, where you will have the unique opportunity to work on global and national building programs with a focus on project and client leadership through all phases of design and delivery. This position is eligible for company benefits including but not limited to: Employer provided employee healthcare plan and reduced cost premium plans, life insurance, and short and long-term disability coverage.
Site Manager I, MEP Gray IncSite Manager I, MEPFullerton, CASince 1960, Gray has grown from a regional contractor to a nationally ranked industry leader, serving top domestic and international companies in the following markets: Manufacturing, Food & Beverage, Data Centers, Advanced Technology, and Distribution. Responsibilities include interviewing, hiring, and training team members; planning, assigning, and directing work; appraising performance; rewarding and disciplining team members; addressing complaints and resolving problems.
NewProject Manager Davron LLCProject ManagerLos Angeles, CA3+ years of direct modular/offsite construction required; 5–10 years total experience in design, permitting, and construction preferred, including 3–6 years managing projects from concept through delivery and installation. PROJECT MANAGER | MODULAR/OFFSITE CONSTRUCTION | AUTODESK BUILD | MICROSOFT EXCEL | MICROSOFT WORD | MICROSOFT PROJECT | PROCORE | RFIS | SUBMITTALS | CHANGE ORDERS | GANTT CHARTING | FIELD VISITS .
Project Manager (Public Safety Software) - Remote Capita Secure Information Solutions LtdProject Manager (Public Safety Software) - RemoteCARemoteA required part of the onboarding process for this role involves obtaining CJIS (Criminal Justice Information Services) clearance-a critical credential for safeguarding public safety data. We offer competitive compensation and a benefits package designed to support your life inside and outside of work-tuition reimbursement, parental leave, paid volunteer hours, and unlimited PTO.
NewPre-Construction Procurement Manager (Remote) Johnson ControlsPre-Construction Procurement Manager (Remote)Los Angeles, CaliforniaRemote$100,000–$150,000 / yearKey functions of this role include: Partnership with Sales during project development phase to own Subcon Installation pricing; Determine Subcon Strategy; Review total Project SOW, qualify and clarify Subcon requirements; Utilize Estimating Tools to develop baseline Subcon Installation Pricing; Source all 3rd Party Sub Quotes; Review Customer documents to ensure adequate provisions are in JCI contract to Subcontractors; Develop, Host, Review all RFPs; Establishes and maintains effective relationships with suppliers and internal customers. About Us Johnson Controls, a global leader in thermal management, mission-critical building systems, energy efficiency, and decarbonization, helps customers use energy more productively, reduce carbon emissions, and operate with the precision and resilience required in rapidly expanding industries such as data centers, healthcare, pharmaceuticals, advanced manufacturing, and higher education.
Preconstruction Manager The Austin CoPreconstruction ManagerIrvine, CA$127,000–$191,000 / yearUnder limited supervision, the Preconstruction Manager is responsible to coordinate all aspects of design build and hard bid technical proposal assembly prior to award, followed by buying subcontracts for construction while working closely with the project manager and/or construction manager utilizing the buyout process as a project specific knowledge transfer vehicle. Working closely with the sales team, lead a team of engineers, designers, constructors, and executives through the technical proposal / bidding process including internal reviews and owner presentations.
Program Manager Black & Veatch Holding CoProgram ManagerLos Angeles, CA$131,974–$224,354 / yearCompany: Black & Veatch Corporation Req Id: 113978 Opportunity Type: Staff Relocation eligible: No Full time/Part time: Full-Time Project Only Hire: No Visa Sponsorship Available: No. ### Why Black & Veatch Black & Veatch allows you to lend your talent and perspective to humanitys biggest challenges in a flexible environment where you are empowered to grow and explore new possibilities. Typical office environment, typical construction environment, extreme weather conditions, high noise level, safety hazards (electric currents, working on scaffolding and high places, exposure to chemicals), atmospheric conditions (fumes, odors, dusts, mists, gases, poor ventilation).