Monitoring Regulations
Select one of the topics below to jump directly to the associated monitoring requirements:
General Monitoring Requirements
2016 EPA Finalizes Amendments to its National Air Quality Monitoring Requirements
March 10, 2016 – This final rule revises monitoring regulations to update requirements as needed to address new technology, and to reorganize and clarify quality assurance sections of the monitoring rules.
- 2016 Final Rule, Federal Register - March 28, 2016
- 2016 Proposed Rule, Federal Register - September 11, 2014
- 2016 Fact Sheet (pdf) (2 pp, 31.7 KB)
2006 - EPA Finalizes Amendments to its National Air Quality Monitoring Requirements
September 28, 2006 - This final rule includes changes to PM2.5 monitoring associated with the 2006 NAAQS review as well as changes to ambient air monitoring and quality assurance requirements associated with the National Ambient Air Monitoring Strategy. Revisions to the PM NAAQS are provided in a separate rule.
- 2006 Final Rule, Federal Register - October 17, 2006
- 2006 Proposed Rule, Federal Register - January 17, 2006
- 2006 Fact Sheet (pdf) (4 pp, 31.2 KB)
Particulate Matter
2012 - EPA Revises the National Ambient Air Quality Standards for Particle Pollution
December 14, 2012 - This final rule includes both ambient air monitoring and NAAQS changes in one rule.
- 2012 Final Rule, Federal Register - January 15, 2013
- 2012 Proposed Rule, Federal Register - June 29, 2012
- 2012 Fact Sheet
2006 - EPA Revises the National Ambient Air Quality Standards for Particle Pollution
October 17, 2006 - This final rule includes both ambient air monitoring and NAAQS changes in one rule.
- Particle Pollution 2006 Final Rule, Federal Register - October 17, 2006
- Particle Pollution 2006 Proposed Rule, Federal Register - January 1, 2006
- Particle Pollution Fact Sheet (pdf) (38.3 KB)
1997 - EPA Finalizes Revised Requirements for Designation of Reference and Equivalent Methods for PM2.5 and Ambient Air Quality Surveillance for Particulate Matter
July 18, 1997 - EPA has revised the ambient air quality surveillance regulations to include provisions for PM2.5 (particulate matter with an aerodynamic diameter less than or equal to a nominal 2.5 micrometers), as measured by a new reference method being published in 40 CFR part 50, Appendix L, or by an equivalent method designated in accordance with requirements being promulgated in 40 CFR Part 53. Part 50 revisions, including the PM2.5 FRM, are included in the Final PM NAAQS Rule.
- Final PM2.5 Monitoring Rule, Federal Register - July 18, 1997
- Final PM2.5 NAAQS Rule, Federal Register - July 18, 1997
- Proposed PM2.5 Monitoring Rule, Federal Register - December 13, 1996
- Proposed PM2.5 NAAQS Rule, Federal Register - December 13, 1996
Ground-Level Ozone
2023- EPA Revises Reference Measurement Principle and Calibration Procedure for the Measurement of Ozone in the Atmosphere (Chemiluminescence Method).
October 5, 2023 - EPA updated the ozone absorption cross-section value used in ultraviolet (UV)-based ozone analyzers and Standard Reference Photometers (SRPs). The updated ozone absorption cross-section value will improve the accuracy of surface ozone monitoring measurements and reduce the uncertainty in measured ozone concentrations.
- Ground-Level Ozone Final Rule, Federal Register - October 12, 2023
- Ground-Level Ozone Proposed Rule, Federal Register - May 31, 2019
- Ground-Level Ozone Fact Sheet (pdf) (2 pp, 137 KB)
2019 - EPA Revises Start Date for the Photochemical Assessment Monitoring Stations (PAMS).
December 20, 2019 - EPA is extending the start date for the required PAMS sites from June 1, 2019, to June 1, 2021. This extension is being made to give states more time to acquire the necessary equipment and expertise needed to successfully make the required PAMS measurements.
- PAMS Final Rule, Federal Register - January 8, 2020
- PAMS Proposed Rule, Federal Register - May 31, 2019
- PAMS Fact Sheet (3 pp, 184 KB)
2015 - EPA Revises the National Ambient Air Quality Standards for Ozone
October 26, 2015 – This final rule includes changes to the ozone and ozone precursor monitoring requirements associated with the 2015 Ozone NAAQS review.
- NAAQS Ozone 2015 Final Rule, Federal Register - October 26, 2015
- NAAQS Ozone 2014 Proposed Rule, Federal Register - December 12, 2014
- NAAQS Ozone 2015 Fact Sheet (pdf) (9 pp, 643 KB)
Other Air Pollutants
Lead
See the AMTIC Lead Monitoring page
Carbon Monoxide
See Carbon Monoxide Regulatory Actions
Nitrogen Dioxide
See Nitrogen Dioxide Regulatory Actions
Sulfur Dioxide
See Sulfur Dioxide Regulatory Actions