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.

Focus is air quality and the mechanics of air pollution. Information about publications, training courses, conferences, and seminars.

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.

Information service on diesel exhaust emissions, emission control technologies, diesel engines, fuels, and related topics.

Presents free accessible articles, publications, events, software, technological solutions and web resources for Air Pollution Control.

Conducts research in measurement and modelling of air quality, including air quality prediction.

Information on compliance technologies, vendors, and case studies for toxic air pollutants (as defined in U.S. regulations).

Provides technical assessments on ozone and other problems of air quality in Illinois, Indiana, Michigan, and Wisconsin. Data and modeling reports available online.

Air Quality monitoring networks of London, Bedfordshire, Kent and Hertfordshire in the UK. Near realtime data is available from the site.

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.