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What's New on Enviro.BLR.com
Enviro.BLR.com's What's New page is where you will find all of the most recent content added and updated to the site in the last 7 days. See the latest reg activity, updated regulatory analysis, training meetings, and news.
Regulatory Analysis
We are continually updating our state and national regulatory analysis to help you keep up with the changing regs. See the updated section on the what's new page to find all of the topics.
Added in the last 7 days
TopicTypeTitle
Air - GeneralFinal Regulations40 CFR 52 - Approval and Promulgation of Air Quality Implementation Plans; Indiana
Mobile SourcesFinal Regulations40 CFR 52 - Approval and Promulgation of Air Quality Implementation Plans; Virginia; Transportation Conformity Regulations
Air - GeneralFinal Regulations40 CFR 52 - Approval and Promulgation of Air Quality Implementation Plans; West Virginia; Maryland; Ohio
Air - GeneralProposed Regulations40 CFR 52 - Approval and Promulgation of Air Quality Implementation Plans; Indiana
Mobile SourcesProposed Regulations40 CFR 52 - Approval and Promulgation of Air Quality Implementation Plans; Virginia; Transportation Conformity Regulations
Air - GeneralNoticesAgency Information Collection Activities; Submission to OMB for Review and Approval; Comment Request; Pressed Wood Manufacturing Industry Survey
Environmental Impact StatementNoticesEnvironmental Impact Statements and Regulations; Availability of EPA Comments
Environmental Impact StatementNoticesEnvironmental Impacts Statements; Notice of Availability
Drinking WaterNoticesNational Drinking Water Advisory Council's Climate Ready Water Utilities Working Group Meeting Announcement
EnforcementNoticesNotice of Lodging of Consent Decree Under CERCLA - United States v. Cabot Corporation, et al.
Air - GeneralNews BriefsMore Counties in Ozone Nonattainment
Hazmat TransportationNews BriefsUtah Updates LP Gas Rules
Spill Prevention (SPCC Plan)News BriefsCompanies Prepared for Oil Spills
Spill Prevention (SPCC Plan)E-lert ArticleChoosing and Working with a PE
EnforcementNews BriefsNovember Enforcement Summary
Underground Storage TanksFinal Regulations503 CMR 2.00, 10, 11 - Underground Storage Tank Petroleum Product Cleanup Fund Regulations Implementing M.G.L. c. 21J
Biennial ReportFormsAnnual Hazardous Waste Report - Instructions
Biennial ReportFormsAnnual Hazardous Waste Report - Form OI and Form GM
Biennial ReportFormsAnnual Hazardous Waste Report - Form WR and Form PS
TSDF PermitsChecklistsPermit-by-Rule Checklist
TSDF PermitsChecklistsPermit Renewal Requirements Checklist
TSDF PermitsChecklistsAdministrative Completeness Checklist for Permit Modification Request or Notification
Hazardous Waste GeneratorsQuestions & AnswersMy facility is going from a small quantity generator of hazardous waste to a large generator due to a one time need to dispose of some obsolete or out of spec paint. Since this is a one time deal will it bumps us to a large quantity generator?
Stormwater News BriefsWhen to Submit an NOI
GroundwaterNews BriefsGroundwater Standards Headed for Revision
Underground Storage TanksNews BriefsFunds for NJ Water Projects
Air - GeneralProposed Regulations40 CFR 52 and 81 - Approval and Promulgation of Implementation Plans and Designation of Areas for Air Quality Planning Purposes; Tennessee
Ag WasteNoticesProposed Reissuance of the NPDES General Permit for Concentrated Animal Feeding Operations Located in Idaho
EnforcementNoticesNotice of Lodging of Consent Decree Under CERCLA - United States v. Allen Greig & Perry, Inc., et al.
Water - GeneralNews BriefsFunds for NY Water Projects
Water - GeneralNews BriefsInspectors Say 'A-OK'
MSDSQuestions & AnswersOn an MSDS under Disposal Considerations they state dispose of in accordance with existing federal, state and local environmental control regulations. How do you find out how to disposal of the materials?
Hazmat TransportationFormsUTC Common Carrier Application Form
Hazmat TransportationFormsUTC Common Carrier Reinstatement Application
Solid WasteRegulatory AnalysisSolid Waste
Used Oil ManagementRegulatory AnalysisUsed Oil Management
PesticidesE-lert ArticlePublic Review Of Pesticides
Aboveground Storage TanksRegulatory AnalysisAboveground Storage Tanks
Air PermittingRegulatory AnalysisAir Emissions Permits
AuditsRegulatory AnalysisAudits
ContainersRegulatory AnalysisContainers
Hazardous Waste DeterminationRegulatory AnalysisHazwaste Determination (Classification)
ChemicalsRegulatory AnalysisImports And Exports Of Chemicals
Land BanRegulatory AnalysisLand Ban
PesticidesRegulatory AnalysisPesticides
Wastewater VariancesRegulatory AnalysisWastewater Variances
BrownfieldsRegulatory AnalysisBrownfields
Air - Ozone Depleting SubstancesRegulatory AnalysisCFC Management
Environmental Protection AgencyRegulatory AnalysisEnvironmental Protection Agency
Hazardous Waste Exports and ImportsRegulatory AnalysisExports And Imports Of Hazardous Waste
Pretreatment StandardsRegulatory AnalysisPretreatment Standards
Climate ChangeRegulatory AnalysisClimate Change
Climate ChangeRegulatory AnalysisClimate Change
PesticidesFinal Regulations40 CFR 180 - Carbofuran; Order Denying FMC's Objections and Requests for Hearing
Air - GeneralProposed Regulations40 CFR 52 - Approval and Promulgation of Air Quality Implementation Plans; California
Hazardous Waste - GeneralProposed Regulations40 CFR 271 - Oregon: Proposed Authorization of State Hazardous Waste Management Program Revision
PesticidesNoticesFIFRA Scientific Advisory Panel; Notice of Public Meeting
PesticidesNoticesPesticide Product; Registration Applications for a New Active Ingredient Flutriafol
PesticidesNoticesXylene; Addendum to the Reregistration Eligibility Decision
Air - GeneralAgency NewsEPA Proposes Stronger Air Quality Standards for Sulfur Dioxide
Underground Storage TanksFinal RegulationsGRR 391-3-15-.02, 05, 13, 16 - Definitions, UST Exclusions, and UST Deferrals; et al.
Oil SpillsQuestions & AnswersIs there a numerical limit for reporting an oil sheen?
Water - GeneralNoticesNotice of Application for Proposed Reservation of Water
Storage Tanks - GeneralFinal RegulationsAL Admin. Code 335-6-16-.07, 09 - Trust Fund Fee and Charge; Scope of Tank Trust Fund Coverage
Underground Storage TanksFinal RegulationsAL Admin. Code 335-6-15-.02, 04, 10, 13, 45, 46, 47 - Definitions; Interim Prohibition for Deferred UST Systems; Operation and Maintenance of Corrosion Protection; Reporting and Recordkeeping; Delivery Prohibition; Operator Training; Severability
Solid WasteFinal RegulationsAL Admin. Code 335-13-13-.01, 02 - Statewide Solid Waste Reduction Goal
LandfillsFinal RegulationsAL Admin. Code 335-13-12-.01, 02, 03, 04 - Landfill Operator Certification Requirements
Air - GeneralProposed RegulationsAL Admin. Code 335-3-10 App. C - Environmental Protection Agency Regulations Reference Documents
Air - GeneralProposed RegulationsAL Admin. Code 335-3-10-.01, 02, 03 - General; Designated Standards of Performance; Appendices to 40 CFR 60
Air - GeneralProposed RegulationsAL Admin. Code 335-3-11-.01, 06, 07 - General; National Emission Standards for Hazardous Air Pollutants for Source Categories; Appendices to 40 CFR 63
Hazardous Waste - GeneralProposed RegulationsAL Admin. Code 335-14-3-.01, 02, 08, 12 - General; The Manifest; Special Requirements for Generators of Waste Destined for Disposal at Commercial Hazardous Waste Disposal Facilities Located; etc
Hazardous Waste - GeneralProposed RegulationsAL Admin. Code 335-14-2-.01; AL Admin. Code 335-14-2 App.IX - General; Wastes Excluded under 335-14-1-.03(2)
Hazardous Waste - GeneralProposed RegulationsAL Admin. Code 335-14-5-.02, 05, 06, 07, 08, 10, 12, 13, 14, 15, 19; AL Amin. Code 335-14-5 App. I - General Facility Standards; Manifest System, Recordkeeping and Reporting; Releases from Solid Waste Management Units; Closure and Post-Closure; etc.
Medical WasteProposed RegulationsAL Admin. Code 335-1-1-.07 - Departmental Forms, Instructions and Procedures
Air - GeneralProposed RegulationsAL Admin. Code 335-3-1-.02 - Definitions
Hazardous Waste - GeneralProposed RegulationsAL Admin. Code 335-14-1-.02 - Definitions and References
Medical WasteProposed RegulationsAL Admin. Code 335-13-7-.01 - Notification of Medical Waste Generation
Medical WasteProposed RegulationsAL Admin. Code 335-1-6-.04 - Permit Application Fees-Fee Schedule G
Hazardous Waste - GeneralProposed RegulationsAL Admin. Code 335-14-8-.02 - Permit Application-Treatment, Storage and Disposal Facilities
Hazardous Waste - GeneralProposed RegulationsAL Admin. Code 335-14-11-.02 - Standards for Small Quantity Handlers of Universal Waste
Used Oil ManagementProposed RegulationsAL Admin. Code 335-14-17-.03, 05 - Standards for Used Oil Generators ; Standards for Used Oil Transporter and Transfer Facilities
Hazardous Waste - GeneralProposed RegulationsAL Admin. Code 335-14-6-.07, 14; AL ADC 335-14-6 App. I - Closure and Post-Closure; Landfills; Recordkeeping Instructions
Hazardous Waste - GeneralProposed RegulationsAL Admin. Code 335-14-4-.05 - Transfer Facility Requirements
Hazardous Waste DeterminationGuidance DocumentsClarification of Ohio EPA's Contained-in Policy (DHWM-010)
RecyclingFinal RegulationsFAC 62-704.400, 410, 420, 600 - Certification of Resource Recovery Equipment
GroundwaterProposed RegulationsFAC 62-531.300, 330, 450 - Application Requirements for Water Well Contractors; Water Well Contractor License Renewal; Unlawful Acts, Grounds for Disciplinary Actions, and Penalties (Notice Only)
Water - GeneralProposed RegulationsFAC 40D-8.624 - Guidance and Minimum Levels for Lakes (Notice Only)
Water - GeneralNoticesNotice of Meeting - Collier Soil and Water Conservation District
PesticidesNoticesNotice of Meeting - Pesticide Registration Evaluation Committee
Water - GeneralNoticesNotice of Meeting Cancellation - Lake Jesup BMAP Basin Working Group
Water - GeneralNoticesNotice of Meeting - Northwest Florida Water Management District Governing Board
Water - GeneralNoticesNotice of Meeting - Northwest Florida Water Management District Governing Board
Water - GeneralNoticesNotice of Workshops - Everglades Forever Act
Water - GeneralNoticesNotice of Mayor Iorio's 22nd Annual Hillsborough River and Waterways Cleanup
Water - GeneralNoticesNotice of Meeting - Southwest Florida Water Management District
Water - GeneralNoticesNotice of Meeting - Established Minimum Water Levels for Certain Surface Waters and Springs
Water PermittingNoticesNotice of Meeting - St. Johns River Water Management District
EnforcementNews BriefsRCRA Failures Cost $126,000
EnforcementNews BriefsMiner Settles Water Violations
Environment - GeneralE-lert Article2010 CRP Budget
OSHAE-lert ArticleFlame-Resistant Conveyor Belts
BrownfieldsNews BriefsTribes Awarded Cleanup Funds
Climate ChangeNews BriefsOregon Deli Energy-Saving Leader
ReportingFinal Regulations40 CFR 3 - Technical Amendment of Cross-Media Electronic Reporting Rule
Environmental Protection AgencyNoticesAgency Information Collection Activities, OMB Responses
SuperfundNoticesAgency Information Collection Activities; Cooperative Agreements and Superfund State Contracts for Superfund Response Actions (Renewal)
SuperfundNoticesCERCLA; Notice of Grant Funding Guidance for State and Tribal Response Programs
Air - GeneralNoticesFinal Notice of Data Availability Concerning Compliance Supplement Pool Allowance Allocations Under the Clean Air Interstate Rule Federal Implementation Plan
Wastewater - GeneralNoticesNotice of a Project Waiver of Section 1605 (Buy American Requirement) of the American Recovery and Reinvestment Act of 2009 to the Town of Greensboro, Maryland
Wastewater - GeneralNoticesNotice of a Regional Project Waiver of Section 1605 (Buy American) of the American Recovery and Reinvestment Act of 2009 to the Town of Newburyport, Massachusetts
Drinking WaterNoticesPublic Water System Supervision Program Revision for Arkansas
Water - GeneralNoticesNew York State Prohibition of Marine Discharges of Vessel Sewage; Receipt of Petition and Final Affirmative Determination
Water - GeneralNoticesOffice of Environmental Information; Announcement of Availability and Comment Period for Revised Environmental Sampling, Analysis and Results Data Standards
EnforcementNoticesNotice of Lodging of Proposed Consent Decree Under CERCLA - United States v. City of St. Maries, et al.
EnforcementNoticesNotice of Lodging Proposed Consent Decree - United States v. Corbett Package Co., et al.
Water - GeneralNoticesNotice of Projects Approved for Consumptive Uses of Water
Water - GeneralProposed RegulationsNDAC 33-16-02.1 - Standards of Quality for Waters
Water - GeneralNoticesNotice of Comment Period on Draft Revised Water Quality Best Management Practices
LeadNoticesIndoor Environments and Radiation Section Request for Comments on Possible Amendment to Rules Governing Lead Poisoning and Prevention
LeadNoticesIndoor Environments and Radiation Section Request for Comments on Possible Amendment to Rules Governing Lead Poisoning and Prevention
Air PermittingNoticesPublic Notice on Draft/proposed Air Emission Facility
Hazardous Waste StorageQuestions & AnswersIs there a requirement to affix a Hazardous Waste label on the large storage tanks in the same manner we label 55-gallon drums with a start accumulation date?
Solid WasteNoticesNotice of Rulemaking Hearing - Solid Waste Processing and Disposal
Stormwater Final Regulations10 CSR 20-4.061 - Storm Water Grant and Loan Program
Water PermittingFinal Regulations10 CSR 20-6.010 - Construction and Operating Permits
EnforcementNoticesNotice of Proposed Consent Order - Wayne Freeze, Jr.
EnforcementNoticesNotice of Proposed Enforcement Action - Zotas Petroleums, LLC
EnforcementNoticesNotice of Proposed Consent Order - Galberry Corporation
EnforcementNoticesNotice of Proposed Consent Order - Vitex Packaging, Inc.
Total Maximum Daily LoadsNoticesNotice of Public Meeting - Total Maximum Daily Load for the Little Calfpasture River in Rockbridge County
Total Maximum Daily LoadsNoticesNotice of Public Meeting - Total Maximum Daily Load Studies in Chuckatuck Creek, Kings Creek and Ballard Marsh Creek, Isle of Wight and Suffolk Counties
Total Maximum Daily LoadsNoticesNotice of Public Meeting - Total Maximum Daily Load Study in Mattawoman Creek, Northampton County
Total Maximum Daily LoadsNoticesNotice of Public Meeting - Total Maximum Daily Load Study in Pettit Branch, Accomack County
EnforcementNoticesNotice of Proposed Consent Order - W. Boutros and Company
EnforcementNoticesNotice of Proposed Consent Order - HHHunt Corporation
EnforcementNoticesNotice of Proposed Action - City of Bedford
EnforcementNoticesNotice of Proposed Action - Town of Farmville
EnforcementNoticesNotice of Proposed Action - West Crossing, LLC
PesticidesNoticesNotice of Petition for Rulemaking - Pesticide Applicator Certification under Authority of Virginia Pesticide Control Act
Water - GeneralNoticesNotice of Petition for Rulemaking - Water Quality Management Planning Regulation
NPDESNoticesNotice of Petition for Rulemaking - Water Quality Management Planning Regulation
Underground Storage TanksProposed Regulations9 VAC 25-580-10, 20, 50, 120, 125, 130, 140, 370 - Underground Storage Tanks: Technical Standards and Corrective Action Requirements
PesticidesNoticesNotice of Withdrawal of Proposed Regulations - Rules and Regulations for Enforcement of the Virginia Pesticide Law; Rules and Regulations for the Registration of Pesticides and Pesticide Products under Authority of the Virginia Pesticide Control Act
BrownfieldsNoticesNotice of Meeting - Cleanup Standards Scientific Advisory Board
Wastewater - GeneralProposed Regulations25 PA Code 95.2, 10 - Wastewater Treatment Requirements [Correction]
Solid WasteNoticesNotice of Receipt of Application and Intent to Obtain a Municipal Solid Waste Permit Major Amendment
Water PermittingNoticesNotice of Water Quality Applications
Solid WasteNoticesNotice of Opportunity to Request a Public Meeting for a New Municipal Solid Waste Transfer Station Registration Application
EnforcementNoticesNotice of Enforcement Orders
EnforcementNoticesNotice of Agreed Orders
Wastewater - GeneralProposed Regulations31 TAC 286.96 - Awards
GroundwaterRegulatory AnalysisGroundwater
Hazardous Air PollutantsGuidance DocumentsWashington Toxic Air Pollutants
Air - GeneralFinal RegulationsCMR 06-096 Ch. 100 - Ch. 100, Definitions
EnforcementNoticesGood Neighbor Environmental Board
EnforcementNoticesProposed Consent Decree, Clean Air Act Citizen Suit
EnforcementNoticesProposed Consent Decree
EnforcementNoticesProposed Settlement Agreement, Clean Air Act Citizen Suit
PesticidesNoticesPesticide Products; Registration Applications
Hazmat TransportationNoticesOffice of Hazardous Materials Safety; Notice of Applications for Modification of Special Permit
Hazmat TransportationNoticesOffice of Hazardous Materials Safety; Notice of Application for Special Permits
Air - GeneralNews BriefsProposed Attainment for Imperial County
Drinking WaterFinal Regulations35 IAC 662.130, 210, 310, 340, 410, 430, 440, 610, 620, 630, 935;et al. - Procedures for Issuing Loans from the Public Water Supply Loan Program
Water - GeneralFinal Regulations35 IAC 365.130, 220, 240, 340, 410, 430, 440, 620, 630; et al. - Procedures for Issuing Loans from the Water Pollution Control Loan Program
Drinking WaterFinal Regulations35 IAC 664.110, 120, 130, 140, 210, 220,, 230, 310, 320, 330, 340, 410, 420, 430, 440, et al. - Procedures for Providing Financial Assistance from the Public Water Supply Loan Program Under the American Recovery and Reinvestment Act of 2009
Water - GeneralFinal Regulations35 IAC 369.110, 120, 130, 140, 210, 220, 230, 240, 310, et al. - Procedures for Providing Financial Assistance from the Water Pollution Control Loan Program Under the American Recovery and Reinvestment Act of 2009
Air – Emissions Trading ProgramsFinal Regulations35 IAC 217.751 - Nitrogen Oxides Emissions
Fuels and Fuel AdditivesNoticesNotice of Hearing - Procedures for Providing Grants from the Illinois Clean Diesel Grant Program
ChemicalsGuidance DocumentsU.S. Department of Energy Interim Guidance on Packaging, Transportation, Receipt, Management, and Long-Term Storage of Elemental Mercury
Water - GeneralProposed Regulations312 IAC 11.5; 312 IAC 11-6 - Surface Water Rights on Freshwater Lakes (Notice Only)
LeadProposed RegulationsEnv-Ws 381 - Lead and Copper (Notice Only)
Drinking WaterProposed RegulationsEnv-Dw 717 - Groundwater Monitoring and Treatment (Notice Only)
Hazardous Air PollutantsProposed RegulationsEnv-A 1400 - Regulated Toxic Air Pollutants (Notice Only)
Air - GeneralProposed RegulationsEnv-A 3700 - NOx Emissions Reduction Fund for NOx-Emitting Generation Sources (Notice Only)
Climate ChangeProposed RegulationsPuc 2600 - Greenhouse Gas Emissions Reduction Fund (Notice Only)
Drinking WaterFinal RegulationsEnv-Dw 1200 - Privately Owned Water Redistribution Systems (Notice Only)
Drinking WaterFinal RegulationsEnv-Dw 304 - Emergency Bulk Water Supply for Public Water Systems (Notice Only)
GroundwaterFinal RegulationsEnv-Wq 403 - Large Groundwater Withdrawals (Notice Only)
Air - GeneralProposed RegulationsEnv-A 501.01; Env-A 502.01; Env-A 503.01; Env-A 504.01; Env-A 505.01 - Standards Applicable to Certain New or Modified Facilities and Sources of Hazardous Air Pollutants
Water - GeneralNoticesNotice of Public Hearing - Outstanding Iowa Waters
Air PermittingNoticesRequest for Comments - Kendall Packaging Corporation
Water - GeneralFinal RegulationsCh. 1 s 1, 2, 3, 4 - General Provisions
Title VNoticesRequest for Comments - City of Wellington Municipal Power Plant-Turbine
Water - GeneralFinal RegulationsCh. 5 s 1 - Public Hearings
Hazardous Waste - GeneralNoticesRequest for Comments - United States Army, Great Plains Redevelopment Authority, and Day and Zimmermann
Water - GeneralFinal RegulationsCh. 6 s 1, 2, 3 - Public Records Requests
Air PermittingNoticesRequest for Comments - Sunflower Electric Power Corporation-Holcomb Station
Water - GeneralFinal RegulationsCh. 2 s 1, 2, 3, 4, 5, 6, 7 - Meetings
Water - GeneralFinal RegulationsCh. 4 s 1 - Public Meetings
Environment - GeneralProposed RegulationsCh. 1 - Requirements for Eligibility in the Voluntary Remediation Program (Notice Only)
Water - GeneralProposed Regulations310 CMR 46.00 - Certification of Well Drillers and Filing of Well Completion Reports (Notice Only)
SuperfundProposed Regulations301 CMR 41.00 - Toxic or Hazardous Substance List (Notice Only)
Water - GeneralFinal RegulationsARM 36.22.302, 307, 1214, 1215, 1216, 1243 - Oil and Gas Provisions and Production
SuperfundProposed RegulationsARM 17.55.102, 108, 111, 114 - Definitions, Facility Listing, Facility Ranking, and Delisting a Facility on the Cecra Priority List
Air PermittingFinal RegulationsARM 17.8.501, 504, 505, 514 - Air Quality; Definitions, Permit Application Fees, Operation Fees, and Open Burning Fees
Wastewater - GeneralFinal RegulationsARM 17.38.101, 208, 211, 212, 213, 214, 225, 229, 231, 513, 701, 702, 703 - Public Water and Sewage System Requirements
Wastewater - GeneralFinal RegulationsARM 17.30.702; ARM 17.36.101, 102, 103, 104, 319, 323, 345, 911, 912, 914, 916, 918, 919, 922; ARM 17.38.101; ARM 17.55.102 - Public Water and Sewage Systems Requirements; Department Circular DEQ-4 and Gray Water Reuse
Air - GeneralFinal RegulationsARM 17.8.102, 302, 767, 802, 822, 902, 1002 - Incorporation by Reference of Current Federal Regulations and Other Materials into Air Quality Rules
Wastewater - GeneralProposed RegulationsARM 17.36.802, 805 - Fee Schedules and Changes in Subdivision
Hazardous Waste - GeneralProposed RegulationsARM 17.53.111, 112, 113, 207, 603 - Hazardous Waste Fees, Registration of Generators, Information Requests, and Annual Reports
SuperfundProposed RegulationsARM 17.55.101, 102, 108, 111, 114 - CECRA Remediation
Climate ChangeNews BriefsSmall Biz Gets Green Thumbs Up
PesticidesAgency NewsUniversity of Michigan Research Finds Water Quality Improvement after Fertilizer Ban
Hazmat TransportationE-lert ArticlePHMSA Steps Up Battery Enforcement
EnergyPowerPointsSaving Energy at Work and Beyond
EnergyQuizzesSaving Energy at Work and Beyond
EnergyHandoutSaving Energy at Work and Beyond
EnergyTraining ExercisesSaving Energy at Work and Beyond
EnergyTraining ExercisesSaving Energy at Work and Beyond
EnergySpeaker's NotesSaving Energy at Work and Beyond
EnergyTrainer's GuidesSaving Energy at Work and Beyond
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OSHA has set standards for workers’ permissible exposure limits (PELs) to airborne hazardous substances. Which of the following is the definition of the ceiling limit?

• The employee's 15-minute time-weighted average exposure, which must not be exceeded at any time during a workday unless another time limit is specified in a parenthetical notation below the limit.
• The employee's maximum allowable average airborne exposure in any 8-hour work shift of a 40-hour workweek.
• An airborne concentration of a toxic substance in the work environment, which should never be exceeded.
Take this week's OSHA Challenge