New Jersey Department Environmental Protection Bureau of Air Monitoring
Current air quality and forecasts for New Jersey.
http://www.state.nj.us/dep/airmon/index.html

NOAA - Atmospheric Turbulence and Diffusion Division
National Oceanic and Atmospheric Administration laboratory research activities are divided into three themes: Air Quality, Emergency Preparedness, and Climate Variability. Each encompasses a number of programs and projects.
http://www.atdd.noaa.gov/

Denver Vehicle Emissions Testing Program
Describes the mandatory vehicle emissions testing program in the Denver-Boulder area of Colorado, including maps to emissions stations, testing requirements, help for failing vehicles and tips to keep from becoming a gross polluter.
http://www.aircarecolorado.com

Air & Waste Management Association (A&WMA )
Environmental information including air pollution, hazardous waste, management, regulations, measuring, modeling, emissions, testing, monitoring, modeling, particulate matter, ozone, and brownfields
http://www.awma.org/

State/Local Air Pollution Control Agencies
The State and Territorial Air Pollution Program Administrators (STAPPA) and the Association of Local Air Pollution Control Officials (ALAPCO) are national associations representing air pollution control agencies in the 54 U.S. states/territories and over 150 major metropolitan areas. Site has information and links.
http://www.4cleanair.org/

EDF Chemical Scorecard
Toxic Release Inventory data for the US (emissions of toxic chemicals to air and water). Search for data on toxic chemicals in your community. Also provides information on human health effects.
http://www.scorecard.org/

DieselNet: Diesel Emissions Online
Information service on diesel exhaust emissions, emission control technologies, diesel engines, fuels, and related topics.
http://www.dieselnet.com/

Clean Air Society of Australia and New Zealand
Focus is air quality and the mechanics of air pollution. Information about publications, training courses, conferences, and seminars.
http://www.casanz.org.au

Lake Michigan Air Directors Consortium
Provides technical assessments on ozone and other problems of air quality in Illinois, Indiana, Michigan, and Wisconsin. Data and modeling reports available online.
http://www.ladco.org

California Air Resources Board
CA air regulations, CA Almanac of Emissions and Air Quality, air emissions modeling, the gasoline additive MTBE, information on reducing air pollution from marine engines, and management of smoke from agricultural burning.
http://www.arb.ca.gov/homepage.htm

Parkland Airshed Management Zone Association
Provides information about the PAMZ, a non-profit multi-stakeholder organization established to manage and monitor air quality issues in central Alberta, Canada.
http://www.pamz.org

Canada's Toxic Release Inventory
Information about releases of pollutants into air, water and land. From Environment Canada.
http://www.ec.gc.ca/pdb/npri/

Bay Area Air Quality Management District
The BAAQMD (District) is the regional, government agency that regulates sources of air pollution within the nine San Francisco Bay Area Counties.
http://www.baaqmd.gov/

Fuel Efficiency Automobile Test Data Center
The site contains vehicle emissions databases and reports remotely collected from in-use vehicles since 1987 from around the world. Data sets include cars, light-trucks, heavy-duty trucks, jet aircraft, locomotives and snowmobiles.
http://www.feat.biochem.du.edu

Clean Air Canada
Up to date information on air quality issues in Canada. Including environmental law and policy, motor vehicle emissions and industrial sources of pollution. Maintained by students at the Environment Law Centre, University of Victoria.
http://www.cleanair.ca

Netherlands National Air Quality Monitoring Network
A division of RIVM, National Institute of Public Health and the Environment. Up-to-date, hourly information about air quality in The Netherlands.
http://www.lml.rivm.nl

U.S. Forest Service Air Quality and Smoke Management Pages
Various materials on air quality and visibility, Forest Service Class I PSD Areas, Integrating Air Quality and Fire Management into Land Management Planning, and smoke and dust from wildland fires.
http://www.fs.fed.us/clean/air/

Title V Policy and Guidance Database
EPA has issued a number of policy and guidance documents that interpret Title V and its regulations. This is a free searchable database which contains EPA-issued policy and guidance documents on air operating permits. You can search the database online or download the database.
http://www.epa.gov/region07/programs/artd/air/title5/title5pg.htm

The Low Emissions Mission
A free resource for Virginia Vehicle Emissions Inspectors. Includes on-line training, discussions forum, tutorials, and a cartoon archive. Citizens who have failed the emissions inspection can use this site for information on causes and repairs that could lead to a passing emissions result.
http://members.tripod.com/Waysafe/

Environmental Software and Modelling Group, Technical University of Madrid
Conducts research in measurement and modelling of air quality, including air quality prediction.
http://artico.lma.fi.upm.es

Automobile Emissions: An Overview
U.S. EPA fact sheet.
http://www.epa.gov/otaq/consumer/05-autos.pdf

Navy Aerosol Analysis and Prediction System (NAAPS)
Includes global, five day forecasts of dust, smoke and sulfate aerosols as well as comparison with satellite analyses.
http://www.nrlmry.navy.mil/aerosol/

UK Air Quality Archive
Features information on the causes and effects of pollution. Includes forecast bulletin, 24 hour summaries and articles.
http://www.airquality.co.uk

Chicago Department of Environment
Gives information on Chicago's air quality and regional pollution prevention programs.
http://egov.cityofchicago.org/city/webportal/portalEntityHomeAction.do?entityName=Environment&entityNameEnumValue=05

National Vehicle and Fuel Emissions Laboratory - U.S. EPA
Federal Government's principal program to control air pollution from motor vehicles. Primary responsibilities include developing programs to reduce mobile source related air pollution; evaluating emission control technology; testing vehicles, engines, and fuels; and determining compliance with Federal emissions and fuel economy standards.
http://www.epa.gov/nvfel/

AIR Web
Air quality and visibility in U.S. national parks, refuges, and other protected areas. From National Park Service Air Resources Division and Fish and Wildlife Services.
http://www2.nature.nps.gov/air/

SEIPH - Environmental Research Group
Air Quality monitoring networks of London, Bedfordshire, Kent and Hertfordshire in the UK. Near realtime data is available from the site.
http://www.londonair.org.uk/london/asp/home.asp

Industrial Center's Air Toxics Compliance Consortium
Information on compliance technologies, vendors, and case studies for toxic air pollutants (as defined in U.S. regulations).
http://www.energysolutionscenter.org/airtoxic/

AIRNOW - U.S. EPA
Air pollution data, ozone forecasting, information about public health and environmental effects of air pollution, and actions you can take to reduce pollution.
http://airnow.gov/

History of the Clean Air Act
Recounts the historical development of United States air quality statutes and regulations, including an introduction to the technical concepts involved.
http://www.ametsoc.org/sloan/cleanair/index.html

Clean Air Task Force
A nonprofit organization dedicated to restoring clean air and healthy environments in the United States through scientific research, public education, and legal advocacy.
http://www.catf.us

Environmental Expert.com
Presents free accessible articles, publications, events, software, technological solutions and web resources for Air Pollution Control.
http://air.environmental-expert.com/