--- title: "Environmental Standards and Limit Values | Aethair" description: "40 air, water, noise, and workplace standards with 221 limit values (EPA NAAQS, WHO 2021, OSHA PEL, ACGIH TLV, WELL v2) and the monitoring configuration…" url: https://aethair.io/standards/ --- 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. [Schedule a call](https://calendly.com/d/ctdd-mkr-v9v/aethair-demo-website) [Build a Configuration](https://aethair.io/build/) In the catalog - [**40** limit standards](#ambient) - [**221** limit values](#by-parameter) - [**38** parameters with a limit](https://aethair.io/parameters/) - [**13** method standards](#methods) Authorities EPA WHO OSHA ACGIH WELL EU UBA DEC AQMD NIOSH CAL CARB 170 USP ISO TC9.9 LEED RESET MSHA Outdoor air ## Ambient Air EPA NAAQS ### [US EPA National Ambient Air Quality Standards (NAAQS)](https://aethair.io/standards/epa_naaqs/) Ambient air: regulatory (USA) 6 parameters · 9 limits PM2.5 PM10 O₃ CO NO₂ +1 WHO 2021 ### [WHO Global Air Quality Guidelines 2021](https://aethair.io/standards/who_aqg_2021/) Ambient air: health guideline (global) 6 parameters · 10 limits PM2.5 PM10 O₃ NO₂ SO₂ +1 EU 2024/2881 ### [EU Ambient Air Quality Directive (EU) 2024/2881](https://aethair.io/standards/eu_aaqd_2024/) Ambient air: regulatory (EU); limit values to be met by 1 Jan 2030 4 parameters · 5 limits PM2.5 PM10 NO₂ SO₂ NYSDEC DER-10 ### [NYSDEC DER-10 Community Air Monitoring Plan (CAMP)](https://aethair.io/standards/nysdec_der10/) Ambient air: remediation site perimeter (New York) 2 parameters · 4 limits PM10 VOC Refinery Sector Rule ### [EPA Petroleum Refinery Sector Rule: fenceline benzene (40 CFR 63.658)](https://aethair.io/standards/epa_refinery_fenceline/) Ambient air: petroleum refinery fenceline (USA) 1 parameter · 1 limit BTEX / speciated VOC EPA HON ### [EPA Hazardous Organic NESHAP (HON): fenceline monitoring (40 CFR 63.184)](https://aethair.io/standards/epa_hon_fenceline/) Ambient air: chemical plant fenceline (USA) 1 parameter · 1 limit BTEX / speciated VOC SCAQMD 1180 ### [SCAQMD Rule 1180: refinery fenceline and community air monitoring](https://aethair.io/standards/scaqmd_1180/) Ambient air: refinery fenceline notification (South Coast AQMD, California) 9 parameters · 9 limits SO₂ H₂S BTEX / speciated VOC CH₂O NH₃ +4 SCAQMD 1466 ### [SCAQMD Rule 1466: particulate emissions from soils with toxic air contaminants](https://aethair.io/standards/scaqmd_1466/) Ambient air: earth-moving on contaminated soil (South Coast AQMD, California) 1 parameter · 1 limit PM10 EPA AQI ### [US EPA Air Quality Index (AQI): PM2.5 breakpoints (2024)](https://aethair.io/standards/epa_aqi/) Ambient air: public air quality reporting (USA) 1 parameter · 5 limits PM2.5 EPA 258.23 ### [EPA Landfill Explosive Gases Control (40 CFR 258.23)](https://aethair.io/standards/epa_landfill_methane/) Ambient air: methane migration at municipal solid waste landfills (USA) 1 parameter · 2 limits CH₄ WHO noise 2018 ### [WHO Environmental Noise Guidelines for the European Region (2018)](https://aethair.io/standards/who_noise_2018/) Ambient air: environmental noise guideline (WHO Europe) 1 parameter · 8 limits Equivalent Continuous Level BAAQMD 12-15 No limits ### [BAAQMD Regulation 12, Rule 15: petroleum refining emissions tracking](https://aethair.io/standards/baaqmd_12_15/) Ambient air: refinery fenceline monitoring (Bay Area, California) 4 parameters BTEX / speciated VOC H₂S SO₂ NH₃ Indoor air ## Indoor Air and Buildings WELL v2 Guide ### [WELL Building Standard v2: Air](https://aethair.io/resources/well-building-standard-air-quality/) Indoor air quality: building certification 8 parameters · 9 limits PM2.5 PM10 CO O₃ CH₂O +3 Radon Action Levels ### [Radon Action / Reference Levels](https://aethair.io/standards/radon_action/) Indoor air: radiological 1 parameter · 2 limits Radon WHO indoor 2010 ### [WHO Indoor Air Quality Guidelines (2010): formaldehyde](https://aethair.io/standards/who_iaq_2010/) Indoor air: health-based guideline (selected value) 1 parameter · 1 limit CH₂O UBA CO₂ ### [Indoor CO₂ Guideline (German UBA / Pettenkofer scale)](https://aethair.io/standards/uba_indoor_co2/) Indoor air: ventilation adequacy guidance 1 parameter · 2 limits CO₂ CARB Air Cleaner ### [CARB Indoor Air Cleaning Device Regulation (17 CCR §94800–94810)](https://aethair.io/standards/carb_air_cleaner/) Indoor: ozone emitted by air cleaning devices (California) 1 parameter · 1 limit O₃ ASHRAE 170 Guide ### [ANSI/ASHRAE/ASHE Standard 170: ventilation of health care facilities](https://aethair.io/resources/ashrae-170-requirements/) Indoor: health care facility ventilation (USA) 3 parameters · 6 limits Differential Pressure Air Temperature Relative Humidity USP 797 ### [USP General Chapter <797>: pharmaceutical compounding, sterile preparations](https://aethair.io/standards/usp_797/) Indoor: sterile compounding pharmacies (USA) 3 parameters · 4 limits Differential Pressure Particle Count Relative Humidity USP 800 ### [USP General Chapter <800>: hazardous drugs, handling in healthcare settings](https://aethair.io/standards/usp_800/) Indoor: hazardous drug compounding (USA) 2 parameters · 2 limits Differential Pressure Relative Humidity ISO 14644-1 ### [ISO 14644-1: cleanroom classification by particle concentration](https://aethair.io/standards/iso_14644_1/) Indoor: cleanrooms and controlled environments 1 parameter · 4 limits Particle Count ASHRAE TC 9.9 ### [ASHRAE TC 9.9: data center contamination and environmental guidelines](https://aethair.io/standards/ashrae_tc99/) Indoor: data centers 2 parameters · 2 limits Particle Count Relative Humidity LEED v5 ### [LEED v5: Indoor Air Quality Performance (Operations and Maintenance)](https://aethair.io/standards/leed_v5/) Indoor: green building certification (LEED v5 O+M) 8 parameters · 10 limits CO₂ PM2.5 PM10 CO O₃ +3 RESET Air ### [RESET Air: commercial interiors performance targets](https://aethair.io/standards/reset_air/) Indoor: building air quality certification (commercial interiors) 3 parameters · 6 limits PM2.5 VOC CO₂ ASHRAE 62.1 No limits ### [ANSI/ASHRAE Standard 62.1: ventilation for acceptable indoor air quality](https://aethair.io/standards/ashrae_62_1/) Indoor: ventilation design (USA) 1 parameter CO₂ Occupational ## Workplace Exposure OSHA PEL Guide ### [OSHA Permissible Exposure Limits (PEL)](https://aethair.io/resources/osha-air-quality-standards-compliance/) Occupational: legal limit (USA), 8-hour TWA unless noted 12 parameters · 12 limits CO H₂S SO₂ NO₂ NH₃ +7 ACGIH TLV ### [ACGIH Threshold Limit Values (TLV)](https://aethair.io/standards/acgih_tlv/) Occupational: recommended guideline, 8-hour TWA unless noted 7 parameters · 9 limits CO H₂S SO₂ NO₂ NH₃ +2 OSHA confined space ### [Confined-Space Atmospheric Limits](https://aethair.io/standards/confined_space/) Occupational: confined-space entry 4 parameters · 4 limits O₂ LEL CO H₂S OSHA / NIOSH noise ### [Occupational Noise Exposure (OSHA / NIOSH)](https://aethair.io/standards/occupational_noise/) Occupational: hearing conservation 2 parameters · 4 limits TWA / Noise Dose Peak Level ACGIH WBGT ### [ACGIH Heat-Stress TLV (WBGT)](https://aethair.io/standards/acgih_wbgt/) Occupational: heat stress 1 parameter · 4 limits WBGT OSHA silica ### [OSHA Respirable Crystalline Silica](https://aethair.io/standards/osha_silica/) Occupational: respirable dust 1 parameter · 2 limits Respirable Crystalline Silica NIOSH REL ### [NIOSH Recommended Exposure Limits (RELs)](https://aethair.io/standards/niosh_rel/) Occupational: recommended guideline (USA), up to 10-hour TWA unless noted 14 parameters · 21 limits CO CO₂ H₂S SO₂ NO +9 OSHA formaldehyde ### [OSHA Formaldehyde Standard (29 CFR 1910.1048)](https://aethair.io/standards/osha_formaldehyde/) Occupational: formaldehyde (USA) 1 parameter · 3 limits CH₂O OSHA benzene ### [OSHA Benzene Standard (29 CFR 1910.1028)](https://aethair.io/standards/osha_benzene/) Occupational: benzene (USA) 1 parameter · 3 limits BTEX / speciated VOC OSHA construction ### [OSHA Construction Exposure Limits (29 CFR 1926.55)](https://aethair.io/standards/osha_construction_pel/) Occupational: construction (USA), 8-hour TWA unless noted 12 parameters · 12 limits CO CO₂ H₂S SO₂ NO +7 Cal/OSHA 5141.1 ### [Cal/OSHA Protection from Wildfire Smoke (8 CCR §5141.1)](https://aethair.io/standards/cal_osha_5141_1/) Occupational: outdoor work in wildfire smoke (California) 1 parameter · 2 limits PM2.5 Cal/OSHA PEL ### [Cal/OSHA Permissible Exposure Limits (8 CCR §5155, Table AC-1)](https://aethair.io/standards/cal_osha_pel/) Occupational: legal limit (California), 8-hour TWA unless noted 13 parameters · 25 limits CO CO₂ H₂S SO₂ NO +8 ISO 23875 ### [ISO 23875: air quality control systems for operator enclosures](https://aethair.io/standards/iso_23875/) Occupational: operator enclosures of mining and heavy machines 3 parameters · 4 limits CO₂ PM4 Differential Pressure MSHA silica ### [MSHA Respirable Crystalline Silica (30 CFR Part 60)](https://aethair.io/standards/msha_silica/) Occupational: mines (USA) 1 parameter · 2 limits Respirable Crystalline Silica MSHA noise ### [MSHA Occupational Noise Exposure (30 CFR Part 62)](https://aethair.io/standards/msha_noise/) Occupational: mines (USA), hearing conservation 2 parameters · 3 limits TWA / Noise Dose Max Level Water ## Drinking and Surface Water EPA drinking water ### [EPA National Drinking Water Standards](https://aethair.io/standards/epa_ndwr/) Drinking water: primary (MCL) and secondary (aesthetic), USA 5 parameters · 5 limits NO₃ Turbidity TDS Chloride pH EPA aquatic life ### [EPA Ambient Water Quality Criteria (Aquatic Life)](https://aethair.io/standards/epa_aquatic_life/) Surface water: aquatic-life protection, USA 2 parameters · 2 limits Dissolved Oxygen pH 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. ISO 21501-4 ### [ISO 21501-4: light-scattering airborne particle counters](https://aethair.io/standards/iso_21501_4/) ISO 3 parameters Particle Count PM2.5 PM10 IEC 61672 ### [IEC 61672: sound level meters (Class 1/2)](https://aethair.io/standards/iec_61672/) IEC 5 parameters SPL Equivalent Continuous Level Peak Level Max Level SEL EPA FRM/FEM ### [US EPA Federal Reference / Equivalent Method (FRM/FEM)](https://aethair.io/standards/epa_frm_fem/) US EPA 3 parameters PM2.5 PM10 O₃ EN 12341 ### [EN 12341: gravimetric PM reference method](https://aethair.io/standards/en_12341/) CEN 2 parameters PM2.5 PM10 ISO 4406 ### [ISO 4406: fluid cleanliness coding (SAE AS4059; NAS 1638 legacy)](https://aethair.io/standards/iso_4406/) ISO 1 parameter ISO 4406 ATA 103 ### [ATA 103 / EI 1581: aviation fuel filtration and differential pressure](https://aethair.io/standards/ata_103/) ATA / EI 1 parameter Fluid Differential Pressure EPA Method 325 ### [EPA Method 325A/B: passive sorbent-tube sampling of fenceline VOCs](https://aethair.io/standards/epa_method_325/) US EPA 1 parameter BTEX / speciated VOC EPA Method 327 ### [EPA Method 327: canister sampling of ethylene oxide and vinyl chloride](https://aethair.io/standards/epa_method_327/) US EPA 0 parameters ISO 7243 ### [ISO 7243: heat stress assessment with the WBGT index](https://aethair.io/standards/iso_7243/) ISO 1 parameter WBGT ISO 11171 ### [ISO 11171: calibration of automatic particle counters for liquids](https://aethair.io/standards/iso_11171/) ISO 1 parameter ISO 4406 IEC 61260 ### [IEC 61260-1: octave-band and fractional-octave-band filters](https://aethair.io/standards/iec_61260/) IEC 2 parameters SPL Equivalent Continuous Level 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](https://aethair.io/parameters/temperature/) [ASHRAE 170](https://aethair.io/resources/ashrae-170-requirements/) - [Ammonia (NH₃)](https://aethair.io/parameters/nh3/) [OSHA PEL](https://aethair.io/resources/osha-air-quality-standards-compliance/) [ACGIH TLV](https://aethair.io/standards/acgih_tlv/) [SCAQMD 1180](https://aethair.io/standards/scaqmd_1180/) [NIOSH REL](https://aethair.io/standards/niosh_rel/) [OSHA construction](https://aethair.io/standards/osha_construction_pel/) [Cal/OSHA PEL](https://aethair.io/standards/cal_osha_pel/) - [BTEX / speciated VOC](https://aethair.io/parameters/btex/) [Refinery Sector Rule](https://aethair.io/standards/epa_refinery_fenceline/) [EPA HON](https://aethair.io/standards/epa_hon_fenceline/) [SCAQMD 1180](https://aethair.io/standards/scaqmd_1180/) [NIOSH REL](https://aethair.io/standards/niosh_rel/) [OSHA benzene](https://aethair.io/standards/osha_benzene/) [Cal/OSHA PEL](https://aethair.io/standards/cal_osha_pel/) - [Carbon Dioxide (CO₂)](https://aethair.io/parameters/co2/) [OSHA PEL](https://aethair.io/resources/osha-air-quality-standards-compliance/) [ACGIH TLV](https://aethair.io/standards/acgih_tlv/) [WELL v2](https://aethair.io/resources/well-building-standard-air-quality/) [UBA CO₂](https://aethair.io/standards/uba_indoor_co2/) [NIOSH REL](https://aethair.io/standards/niosh_rel/) [OSHA construction](https://aethair.io/standards/osha_construction_pel/) [Cal/OSHA PEL](https://aethair.io/standards/cal_osha_pel/) [LEED v5](https://aethair.io/standards/leed_v5/) [RESET Air](https://aethair.io/standards/reset_air/) [ISO 23875](https://aethair.io/standards/iso_23875/) - [Carbon Monoxide (CO)](https://aethair.io/parameters/co/) [EPA NAAQS](https://aethair.io/standards/epa_naaqs/) [WHO 2021](https://aethair.io/standards/who_aqg_2021/) [OSHA PEL](https://aethair.io/resources/osha-air-quality-standards-compliance/) [ACGIH TLV](https://aethair.io/standards/acgih_tlv/) [OSHA confined space](https://aethair.io/standards/confined_space/) [WELL v2](https://aethair.io/resources/well-building-standard-air-quality/) [NIOSH REL](https://aethair.io/standards/niosh_rel/) [OSHA construction](https://aethair.io/standards/osha_construction_pel/) [Cal/OSHA PEL](https://aethair.io/standards/cal_osha_pel/) [LEED v5](https://aethair.io/standards/leed_v5/) - [Chloride](https://aethair.io/parameters/chloride/) [EPA drinking water](https://aethair.io/standards/epa_ndwr/) - [Chlorine (Cl₂)](https://aethair.io/parameters/cl2/) [OSHA PEL](https://aethair.io/resources/osha-air-quality-standards-compliance/) [NIOSH REL](https://aethair.io/standards/niosh_rel/) [OSHA construction](https://aethair.io/standards/osha_construction_pel/) [Cal/OSHA PEL](https://aethair.io/standards/cal_osha_pel/) - [Combustible (LEL)](https://aethair.io/parameters/lel/) [OSHA confined space](https://aethair.io/standards/confined_space/) - [Differential Pressure](https://aethair.io/parameters/differential_pressure/) [ASHRAE 170](https://aethair.io/resources/ashrae-170-requirements/) [USP 797](https://aethair.io/standards/usp_797/) [USP 800](https://aethair.io/standards/usp_800/) [ISO 23875](https://aethair.io/standards/iso_23875/) - [Dissolved Oxygen](https://aethair.io/parameters/do/) [EPA aquatic life](https://aethair.io/standards/epa_aquatic_life/) - [Equivalent Continuous Level (Leq)](https://aethair.io/parameters/sound_leq/) [WHO noise 2018](https://aethair.io/standards/who_noise_2018/) - [Formaldehyde (CH₂O)](https://aethair.io/parameters/ch2o/) [WELL v2](https://aethair.io/resources/well-building-standard-air-quality/) [WHO indoor 2010](https://aethair.io/standards/who_iaq_2010/) [SCAQMD 1180](https://aethair.io/standards/scaqmd_1180/) [NIOSH REL](https://aethair.io/standards/niosh_rel/) [OSHA formaldehyde](https://aethair.io/standards/osha_formaldehyde/) [LEED v5](https://aethair.io/standards/leed_v5/) - [Hydrogen Chloride (HCl)](https://aethair.io/parameters/hcl/) [OSHA PEL](https://aethair.io/resources/osha-air-quality-standards-compliance/) [NIOSH REL](https://aethair.io/standards/niosh_rel/) [OSHA construction](https://aethair.io/standards/osha_construction_pel/) [Cal/OSHA PEL](https://aethair.io/standards/cal_osha_pel/) - [Hydrogen Fluoride (HF)](https://aethair.io/parameters/hf/) [OSHA PEL](https://aethair.io/resources/osha-air-quality-standards-compliance/) [SCAQMD 1180](https://aethair.io/standards/scaqmd_1180/) [NIOSH REL](https://aethair.io/standards/niosh_rel/) [OSHA construction](https://aethair.io/standards/osha_construction_pel/) [Cal/OSHA PEL](https://aethair.io/standards/cal_osha_pel/) - [Hydrogen Sulfide (H₂S)](https://aethair.io/parameters/h2s/) [OSHA PEL](https://aethair.io/resources/osha-air-quality-standards-compliance/) [ACGIH TLV](https://aethair.io/standards/acgih_tlv/) [OSHA confined space](https://aethair.io/standards/confined_space/) [SCAQMD 1180](https://aethair.io/standards/scaqmd_1180/) [NIOSH REL](https://aethair.io/standards/niosh_rel/) [OSHA construction](https://aethair.io/standards/osha_construction_pel/) [Cal/OSHA PEL](https://aethair.io/standards/cal_osha_pel/) - [Max Level (Lmax)](https://aethair.io/parameters/sound_lmax/) [MSHA noise](https://aethair.io/standards/msha_noise/) - [Mercury (Hg)](https://aethair.io/parameters/hg/) [OSHA PEL](https://aethair.io/resources/osha-air-quality-standards-compliance/) [NIOSH REL](https://aethair.io/standards/niosh_rel/) [OSHA construction](https://aethair.io/standards/osha_construction_pel/) [Cal/OSHA PEL](https://aethair.io/standards/cal_osha_pel/) - [Methane (CH₄)](https://aethair.io/parameters/ch4/) [EPA 258.23](https://aethair.io/standards/epa_landfill_methane/) - [Nitrate (NO₃)](https://aethair.io/parameters/nitrate/) [EPA drinking water](https://aethair.io/standards/epa_ndwr/) - [Nitric Oxide (NO)](https://aethair.io/parameters/no/) [OSHA PEL](https://aethair.io/resources/osha-air-quality-standards-compliance/) [NIOSH REL](https://aethair.io/standards/niosh_rel/) [OSHA construction](https://aethair.io/standards/osha_construction_pel/) [Cal/OSHA PEL](https://aethair.io/standards/cal_osha_pel/) - [Nitrogen Dioxide (NO₂)](https://aethair.io/parameters/no2/) [EPA NAAQS](https://aethair.io/standards/epa_naaqs/) [WHO 2021](https://aethair.io/standards/who_aqg_2021/) [OSHA PEL](https://aethair.io/resources/osha-air-quality-standards-compliance/) [ACGIH TLV](https://aethair.io/standards/acgih_tlv/) [EU 2024/2881](https://aethair.io/standards/eu_aaqd_2024/) [NIOSH REL](https://aethair.io/standards/niosh_rel/) [OSHA construction](https://aethair.io/standards/osha_construction_pel/) [Cal/OSHA PEL](https://aethair.io/standards/cal_osha_pel/) [LEED v5](https://aethair.io/standards/leed_v5/) - [Oxygen (O₂)](https://aethair.io/parameters/o2/) [OSHA confined space](https://aethair.io/standards/confined_space/) - [Ozone (O₃)](https://aethair.io/parameters/o3/) [EPA NAAQS](https://aethair.io/standards/epa_naaqs/) [WHO 2021](https://aethair.io/standards/who_aqg_2021/) [OSHA PEL](https://aethair.io/resources/osha-air-quality-standards-compliance/) [ACGIH TLV](https://aethair.io/standards/acgih_tlv/) [WELL v2](https://aethair.io/resources/well-building-standard-air-quality/) [NIOSH REL](https://aethair.io/standards/niosh_rel/) [OSHA construction](https://aethair.io/standards/osha_construction_pel/) [Cal/OSHA PEL](https://aethair.io/standards/cal_osha_pel/) [CARB Air Cleaner](https://aethair.io/standards/carb_air_cleaner/) [LEED v5](https://aethair.io/standards/leed_v5/) - [Particle Count (by size)](https://aethair.io/parameters/particle_count/) [USP 797](https://aethair.io/standards/usp_797/) [ISO 14644-1](https://aethair.io/standards/iso_14644_1/) [ASHRAE TC 9.9](https://aethair.io/standards/ashrae_tc99/) - [Peak Level (Lpeak)](https://aethair.io/parameters/sound_lpeak/) [OSHA / NIOSH noise](https://aethair.io/standards/occupational_noise/) - [pH](https://aethair.io/parameters/ph/) [EPA drinking water](https://aethair.io/standards/epa_ndwr/) [EPA aquatic life](https://aethair.io/standards/epa_aquatic_life/) - [PM10](https://aethair.io/parameters/pm10/) [EPA NAAQS](https://aethair.io/standards/epa_naaqs/) [WHO 2021](https://aethair.io/standards/who_aqg_2021/) [WELL v2](https://aethair.io/resources/well-building-standard-air-quality/) [EU 2024/2881](https://aethair.io/standards/eu_aaqd_2024/) [NYSDEC DER-10](https://aethair.io/standards/nysdec_der10/) [SCAQMD 1180](https://aethair.io/standards/scaqmd_1180/) [SCAQMD 1466](https://aethair.io/standards/scaqmd_1466/) [LEED v5](https://aethair.io/standards/leed_v5/) - [PM2.5](https://aethair.io/parameters/pm2_5/) [EPA NAAQS](https://aethair.io/standards/epa_naaqs/) [WHO 2021](https://aethair.io/standards/who_aqg_2021/) [WELL v2](https://aethair.io/resources/well-building-standard-air-quality/) [EU 2024/2881](https://aethair.io/standards/eu_aaqd_2024/) [SCAQMD 1180](https://aethair.io/standards/scaqmd_1180/) [Cal/OSHA 5141.1](https://aethair.io/standards/cal_osha_5141_1/) [EPA AQI](https://aethair.io/standards/epa_aqi/) [LEED v5](https://aethair.io/standards/leed_v5/) [RESET Air](https://aethair.io/standards/reset_air/) - [PM4 (Respirable)](https://aethair.io/parameters/pm4/) [ISO 23875](https://aethair.io/standards/iso_23875/) - [Radon](https://aethair.io/parameters/radon/) [WELL v2](https://aethair.io/resources/well-building-standard-air-quality/) [Radon Action Levels](https://aethair.io/standards/radon_action/) - [Relative Humidity](https://aethair.io/parameters/humidity/) [ASHRAE 170](https://aethair.io/resources/ashrae-170-requirements/) [USP 797](https://aethair.io/standards/usp_797/) [USP 800](https://aethair.io/standards/usp_800/) [ASHRAE TC 9.9](https://aethair.io/standards/ashrae_tc99/) - [Respirable Crystalline Silica](https://aethair.io/parameters/silica/) [OSHA silica](https://aethair.io/standards/osha_silica/) [MSHA silica](https://aethair.io/standards/msha_silica/) - [Sulfur Dioxide (SO₂)](https://aethair.io/parameters/so2/) [EPA NAAQS](https://aethair.io/standards/epa_naaqs/) [WHO 2021](https://aethair.io/standards/who_aqg_2021/) [OSHA PEL](https://aethair.io/resources/osha-air-quality-standards-compliance/) [ACGIH TLV](https://aethair.io/standards/acgih_tlv/) [EU 2024/2881](https://aethair.io/standards/eu_aaqd_2024/) [SCAQMD 1180](https://aethair.io/standards/scaqmd_1180/) [NIOSH REL](https://aethair.io/standards/niosh_rel/) [OSHA construction](https://aethair.io/standards/osha_construction_pel/) [Cal/OSHA PEL](https://aethair.io/standards/cal_osha_pel/) - [TDS](https://aethair.io/parameters/tds/) [EPA drinking water](https://aethair.io/standards/epa_ndwr/) - [Turbidity](https://aethair.io/parameters/turbidity/) [EPA drinking water](https://aethair.io/standards/epa_ndwr/) - [TWA / Noise Dose](https://aethair.io/parameters/sound_twa/) [OSHA / NIOSH noise](https://aethair.io/standards/occupational_noise/) [MSHA noise](https://aethair.io/standards/msha_noise/) - [VOC (Total)](https://aethair.io/parameters/voc/) [WELL v2](https://aethair.io/resources/well-building-standard-air-quality/) [NYSDEC DER-10](https://aethair.io/standards/nysdec_der10/) [SCAQMD 1180](https://aethair.io/standards/scaqmd_1180/) [LEED v5](https://aethair.io/standards/leed_v5/) [RESET Air](https://aethair.io/standards/reset_air/) - [WBGT (Heat Stress)](https://aethair.io/parameters/wbgt/) [ACGIH WBGT](https://aethair.io/standards/acgih_wbgt/)