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National Summary
The federal Clean Air Act (CAA) was enacted in 1970 because of increasing concerns over the quality of the nation's air. The CAA was amended in 1977 and 1990. Simply put, the purpose of the CAA is to protect and improve the nation's air quality, the stratospheric ozone layer, and the public's health. Through the CAA's various mandates, the United States has seen the quality of its air greatly improve over the past few decades.
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 2410 items in 61 pages
Proposed Regulations 40 CFR 52 - Approval and Promulgation of Air Quality Implementation Plans; Delaware; Attainment Plan for the Philadelphia-Wilmington Nonattainment Area for the 1997 Annual PM-2.5 Standard 09/19/2013National
Notices Integrated Science Assessment for Oxides of Sulfur 05/10/2013National
Proposed Regulations 0 CFR 52, 40 CFR 70 - Air Plan Approval; Iowa; State Implementation Plan and Operating Permits Program 10/02/2018National
Proposed Regulations 20 CFR 52 - Air Quality Implementation Plans, Virginia 05/21/2014National
Notices 2012 Fall Joint Meeting of the Ozone Transport Commission and the Mid-Atlantic Northeast Visibility Union 10/26/2012National
Notices 2013 Annual Meeting of the Ozone Transport Commission 04/30/2013National
Notices 2017 and Later Model Year Light-Duty Vehicle Greenhouse Gas Emissions and Corporate Average Fuel Economy Standards 11/15/2012National
Proposed Regulations 40 CF 52 - Approval and Promulgation of Air Quality Implementation Plans; Maryland 07/05/2018National
Final Regulations 40 CFR 52 - Approval and Promulgation of Air Quality Implementation Plans; Virginia; Removal of Consumer and Commercial Products Rules 07/03/2013National
Final Regulations 40 CFR 52 - Approval and Promulgation of State Implementation Plans; Idaho; Regional Haze Progress Report 07/15/2019National
Proposed Regulations 40 CFR - Air Plan Approval: Lane County, Oregon; 2019 Permitting Rule Revisions 08/14/2019National
Proposed Regulations 40 CFR 1037 and 1068 - Repeal of Emission Requirements for Glider Vehicles, Glider Engines, and Glider Kits 11/16/2017National
Final Regulations 40 CFR 1037, 1039, 1042, 1068 and 49 CFR Part 535 - Heavy-Duty Engine and Vehicle and Nonroad 08/16/2013National
Final Regulations 40 CFR 1037, 1039, 1042, and 1068 - Heavy-Duty Engine and Vehicle and Nonroad Technical Amendments 09/12/2013National
Final Regulations 40 CFR 1039, 1042, and 1068 - Nonroad Technical Amendments 02/06/2014National
Final Regulations 40 CFR 1065 - Engine-Testing Procedures 03/14/2019National
Final Regulations 40 CFR 180 - Approval of Louisiana's Request To Relax the Federal Reid Vapor Pressure (RVP) Gasoline Standard for the Baton Rouge Area 10/24/2018National
Proposed Regulations 40 CFR 190 - Environmental Radiation Protection Standards for Nuclear Power Operations 02/04/2014National
Final Regulations 40 CFR 29 and 52 - Air Plan Revisions; Salt River Pima-Maricopa Indian Community; Navajo Nation; California; Correcting Amendments 03/28/2018National
Proposed Regulations 40 CFR 35 - Clean Air Act Grant: Santa Barbara County Air Pollution Control District 07/03/2014National
Proposed Regulations 40 CFR 35 - Clean Air Act Grant: South Coast Air Quality Management District; Opportunity for Public Hearing 03/18/2013National
Proposed Regulations 40 CFR 35 - Clean Air Act Grant: South Coast Air Quality Management District; Opportunity for Public Hearing 03/18/2014National
Proposed Regulations 40 CFR 49 - Proposed BART Determination, Navajo Nation 09/25/2013National
Final Regulations 40 CFR 49 - Source Specific FIP for Implementing BART for Four Corners Power Plant: Navajo Nation 08/24/2012National
Final Regulations 40 CFR 49 - Air Implementation Plan, Navajo Nation Indian Reservation 10/02/2013National
Final Regulations 40 CFR 49 - Air Quality Implementation Plans, North Dakota 03/22/2013National
Proposed Regulations 40 CFR 49 - Air Quality Implementation Plans; Navajo Nation 07/09/2013National
Final Regulations 40 CFR 49 - Amendments to Federal Implementation Plan for Managing Air Emissions From True Minor Sources in Indian Country in the Oil and Natural Gas Production and Natural Gas Processing Segments of the Oil and Natural Gas Sector 05/14/2019National
Proposed Regulations 40 CFR 49 - Approval and Promulgation of Implementation Plans; Swinomish Indian Tribal Community; Tribal Implementation Plan 05/02/2014National
Proposed Regulations 40 CFR 49 - Approval of Air Quality Implementation Plans; Navajo Nation; Regional Haze Requirements for Navajo Generating Station; Extension of Comment Period 03/19/2013National
Notices 40 CFR 49 - Approval of Air Quality Implementation Plans; Navajo Nation; Regional Haze Requirements for Navajo Generating Station; Notice of Intent To Hold Public Hearings 06/19/2013National
Proposed Regulations 40 CFR 49 - Approval of Air Quality Implementation Plans; Navajo Nation; Regional Haze Requirements for Navajo Generating Station; Proposed Rule 02/05/2013National
Proposed Regulations 40 CFR 49 - Approval of Air Quality Implementation Plans; Navajo Nation; Regional Haze Requirements for Navajo Generating Station; Supplemental Proposal 10/22/2013National
Proposed Regulations 40 CFR 49 - Federal Implementation Plan To Establish a Bank for Ozone Precursor Emission Reduction Credits From Existing Sources on Indian Country Lands Within the Uinta Basin Ozone Nonattainment Area 05/24/2019National
Proposed Regulations 40 CFR 49 - Federal Implementation Plan To Establish a Bank for Ozone Precursor Emission Reduction Credits From Existing Sources on Indian Country Lands Within the Uinta Basin Ozone Nonattainment Area 07/03/2019National
Final Regulations 40 CFR 49 - Revision to Approval of Application Submitted by Eastern Shoshone Tribe and Northern Arapaho Tribe for Treatment in a Similar Manner as a State Under the Clean Air Act 03/05/2019National
Proposed Regulations 40 CFR 49 - Source Specific Federal Implementation Plan for Implementing Best Available Retrofit Technology for Four Corners Power Plant; Navajo Nation; Extension of Notification Deadline 07/11/2013National
Proposed Regulations 40 CFR 49 and 49 CFR 52 - Indian Country: Air Quality Planning and Management; Federal Implementation Plan for the Kalispel Indian Community of the Kalispel Reservation, Washington; Redesignation to a PSD Class I Area 10/31/2018National
Final Regulations 40 CFR 49 and 52 - Indian Country: Air Quality Planning and Management; Federal 07/18/2019National
Proposed Regulations 40 CFR 49 and 52 - Indian Country: Air Quality Planning and Management; Federal Implementation Plan for the Kalispel Indian Community of the Kalispel Reservation, Washington; Redesignation to a PSD Class I Area 02/05/2019National