Compliance
Environmental Standards and Limit Values
Air, water, noise, and workplace: the numbers a monitoring program is judged against
Each standard's page lists every limit value with its averaging period, who the standard applies to, and how monitoring shows compliance. It then recommends a configuration that covers the standard and lists the solutions judged against it.
Outdoor air
Ambient Air
EPA NAAQSUS EPA National Ambient Air Quality Standards (NAAQS)
Ambient air: regulatory (USA)
WHO 2021WHO Global Air Quality Guidelines 2021
Ambient air: health guideline (global)
EU 2024/2881EU Ambient Air Quality Directive (EU) 2024/2881
Ambient air: regulatory (EU); limit values to be met by 1 Jan 2030
NYSDEC DER-10NYSDEC DER-10 Community Air Monitoring Plan (CAMP)
Ambient air: remediation site perimeter (New York)
Refinery Sector RuleEPA Petroleum Refinery Sector Rule: fenceline benzene (40 CFR 63.658)
Ambient air: petroleum refinery fenceline (USA)
EPA HONEPA Hazardous Organic NESHAP (HON): fenceline monitoring (40 CFR 63.184)
Ambient air: chemical plant fenceline (USA)
SCAQMD 1180SCAQMD Rule 1180: refinery fenceline and community air monitoring
Ambient air: refinery fenceline notification (South Coast AQMD, California)
SCAQMD 1466SCAQMD Rule 1466: particulate emissions from soils with toxic air contaminants
Ambient air: earth-moving on contaminated soil (South Coast AQMD, California)
EPA AQIUS EPA Air Quality Index (AQI): PM2.5 breakpoints (2024)
Ambient air: public air quality reporting (USA)
EPA 258.23EPA Landfill Explosive Gases Control (40 CFR 258.23)
Ambient air: methane migration at municipal solid waste landfills (USA)
WHO noise 2018WHO Environmental Noise Guidelines for the European Region (2018)
Ambient air: environmental noise guideline (WHO Europe)
BAAQMD 12-15No limitsBAAQMD Regulation 12, Rule 15: petroleum refining emissions tracking
Ambient air: refinery fenceline monitoring (Bay Area, California)
Indoor air
Indoor Air and Buildings
WELL v2GuideWELL Building Standard v2: Air
Indoor air quality: building certification
WHO indoor 2010WHO Indoor Air Quality Guidelines (2010): formaldehyde
Indoor air: health-based guideline (selected value)
UBA CO₂Indoor CO₂ Guideline (German UBA / Pettenkofer scale)
Indoor air: ventilation adequacy guidance
CARB Air CleanerCARB Indoor Air Cleaning Device Regulation (17 CCR §94800–94810)
Indoor: ozone emitted by air cleaning devices (California)
ASHRAE 170GuideANSI/ASHRAE/ASHE Standard 170: ventilation of health care facilities
Indoor: health care facility ventilation (USA)
USP 797USP General Chapter <797>: pharmaceutical compounding, sterile preparations
Indoor: sterile compounding pharmacies (USA)
USP 800USP General Chapter <800>: hazardous drugs, handling in healthcare settings
Indoor: hazardous drug compounding (USA)
ISO 14644-1ISO 14644-1: cleanroom classification by particle concentration
Indoor: cleanrooms and controlled environments
ASHRAE TC 9.9ASHRAE TC 9.9: data center contamination and environmental guidelines
Indoor: data centers
LEED v5LEED v5: Indoor Air Quality Performance (Operations and Maintenance)
Indoor: green building certification (LEED v5 O+M)
RESET AirRESET Air: commercial interiors performance targets
Indoor: building air quality certification (commercial interiors)
ASHRAE 62.1No limitsANSI/ASHRAE Standard 62.1: ventilation for acceptable indoor air quality
Indoor: ventilation design (USA)
Occupational
Workplace Exposure
OSHA PELGuideOSHA Permissible Exposure Limits (PEL)
Occupational: legal limit (USA), 8-hour TWA unless noted
ACGIH TLVACGIH Threshold Limit Values (TLV)
Occupational: recommended guideline, 8-hour TWA unless noted
OSHA / NIOSH noiseOccupational Noise Exposure (OSHA / NIOSH)
Occupational: hearing conservation
OSHA silicaOSHA Respirable Crystalline Silica
Occupational: respirable dust
NIOSH RELNIOSH Recommended Exposure Limits (RELs)
Occupational: recommended guideline (USA), up to 10-hour TWA unless noted
OSHA formaldehydeOSHA Formaldehyde Standard (29 CFR 1910.1048)
Occupational: formaldehyde (USA)
OSHA benzeneOSHA Benzene Standard (29 CFR 1910.1028)
Occupational: benzene (USA)
OSHA constructionOSHA Construction Exposure Limits (29 CFR 1926.55)
Occupational: construction (USA), 8-hour TWA unless noted
Cal/OSHA 5141.1Cal/OSHA Protection from Wildfire Smoke (8 CCR §5141.1)
Occupational: outdoor work in wildfire smoke (California)
Cal/OSHA PELCal/OSHA Permissible Exposure Limits (8 CCR §5155, Table AC-1)
Occupational: legal limit (California), 8-hour TWA unless noted
ISO 23875ISO 23875: air quality control systems for operator enclosures
Occupational: operator enclosures of mining and heavy machines
MSHA silicaMSHA Respirable Crystalline Silica (30 CFR Part 60)
Occupational: mines (USA)
MSHA noiseMSHA Occupational Noise Exposure (30 CFR Part 62)
Occupational: mines (USA), hearing conservation
Water
Drinking and Surface Water
EPA drinking waterEPA National Drinking Water Standards
Drinking water: primary (MCL) and secondary (aesthetic), USA
EPA aquatic lifeEPA Ambient Water Quality Criteria (Aquatic Life)
Surface water: aquatic-life protection, USA
Methods
Measurement Method Standards
How a parameter is measured rather than what it may reach: the designations and classes that make an instrument's reading count.
IEC 61672IEC 61672: sound level meters (Class 1/2)
IEC
ATA 103ATA 103 / EI 1581: aviation fuel filtration and differential pressure
ATA / EI
EPA Method 325EPA Method 325A/B: passive sorbent-tube sampling of fenceline VOCs
US EPA
IEC 61260IEC 61260-1: octave-band and fractional-octave-band filters
IEC
By parameter
Which Standards Set a Limit for It
Every parameter with a published limit in the catalog, and the standards that set one. Each parameter's page lists the values side by side.
- Air Temperature ASHRAE 170
- Ammonia (NH₃) OSHA PEL ACGIH TLV SCAQMD 1180 NIOSH REL OSHA construction Cal/OSHA PEL
- BTEX / speciated VOC Refinery Sector Rule EPA HON SCAQMD 1180 NIOSH REL OSHA benzene Cal/OSHA PEL
- Carbon Dioxide (CO₂) OSHA PEL ACGIH TLV WELL v2 UBA CO₂ NIOSH REL OSHA construction Cal/OSHA PEL LEED v5 RESET Air ISO 23875
- Carbon Monoxide (CO) EPA NAAQS WHO 2021 OSHA PEL ACGIH TLV OSHA confined space WELL v2 NIOSH REL OSHA construction Cal/OSHA PEL LEED v5
- Chloride EPA drinking water
- Chlorine (Cl₂) OSHA PEL NIOSH REL OSHA construction Cal/OSHA PEL
- Combustible (LEL) OSHA confined space
- Differential Pressure ASHRAE 170 USP 797 USP 800 ISO 23875
- Dissolved Oxygen EPA aquatic life
- Equivalent Continuous Level (Leq) WHO noise 2018
- Formaldehyde (CH₂O) WELL v2 WHO indoor 2010 SCAQMD 1180 NIOSH REL OSHA formaldehyde LEED v5
- Hydrogen Chloride (HCl) OSHA PEL NIOSH REL OSHA construction Cal/OSHA PEL
- Hydrogen Fluoride (HF) OSHA PEL SCAQMD 1180 NIOSH REL OSHA construction Cal/OSHA PEL
- Hydrogen Sulfide (H₂S) OSHA PEL ACGIH TLV OSHA confined space SCAQMD 1180 NIOSH REL OSHA construction Cal/OSHA PEL
- Max Level (Lmax) MSHA noise
- Mercury (Hg) OSHA PEL NIOSH REL OSHA construction Cal/OSHA PEL
- Methane (CH₄) EPA 258.23
- Nitrate (NO₃) EPA drinking water
- Nitric Oxide (NO) OSHA PEL NIOSH REL OSHA construction Cal/OSHA PEL
- Nitrogen Dioxide (NO₂) EPA NAAQS WHO 2021 OSHA PEL ACGIH TLV EU 2024/2881 NIOSH REL OSHA construction Cal/OSHA PEL LEED v5
- Oxygen (O₂) OSHA confined space
- Ozone (O₃) EPA NAAQS WHO 2021 OSHA PEL ACGIH TLV WELL v2 NIOSH REL OSHA construction Cal/OSHA PEL CARB Air Cleaner LEED v5
- Particle Count (by size) USP 797 ISO 14644-1 ASHRAE TC 9.9
- Peak Level (Lpeak) OSHA / NIOSH noise
- pH EPA drinking water EPA aquatic life
- PM10 EPA NAAQS WHO 2021 WELL v2 EU 2024/2881 NYSDEC DER-10 SCAQMD 1180 SCAQMD 1466 LEED v5
- PM2.5 EPA NAAQS WHO 2021 WELL v2 EU 2024/2881 SCAQMD 1180 Cal/OSHA 5141.1 EPA AQI LEED v5 RESET Air
- PM4 (Respirable) ISO 23875
- Radon WELL v2 Radon Action Levels
- Relative Humidity ASHRAE 170 USP 797 USP 800 ASHRAE TC 9.9
- Respirable Crystalline Silica OSHA silica MSHA silica
- Sulfur Dioxide (SO₂) EPA NAAQS WHO 2021 OSHA PEL ACGIH TLV EU 2024/2881 SCAQMD 1180 NIOSH REL OSHA construction Cal/OSHA PEL
- TDS EPA drinking water
- Turbidity EPA drinking water
- TWA / Noise Dose OSHA / NIOSH noise MSHA noise
- VOC (Total) WELL v2 NYSDEC DER-10 SCAQMD 1180 LEED v5 RESET Air
- WBGT (Heat Stress) ACGIH WBGT
Monitor Against the Standards That Apply to You
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