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P2 for Area Source Categories: Background and Overview
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Air Toxics Strategy
This fact sheet defines "air toxics" and gives an overview of the goals of the Air Toxics Strategy, ...

Technology Transfer for the Air Toxics Rules
Information regarding the status and history of rulemaking process for air toxics including area sou...

A Short History of Air Pollution Regulation

Regulation of Hazardous Air Pollutants (HAPs) in the United States has been an evolving process beginning as early as 1881 in the cities of Chicago and Cincinnati. The first federal effort at air pollution regulation began in 1955 with the Air Pollution Control Act, the precursor to the current Clean Air Act (CAA). The first air pollution sources regulated were the largest stationary emitters as well as some vehicle categories. Currently the focus of new regulation is on the smaller but more numerous emitters in the industrial and commercial sectors termed the "area sources". Their collective impact on air pollution is very significant. In order to continue to improve ambient air quality, these smaller sources must reduce their hazardous air emissions.

Hazardous Air Pollution Sources, 2002

Area Source Standards and the EPA's Urban Air Toxics Strategy

The Urban Air Toxics Strategy within the CAA required Environmental Protection Agency (EPA) to identify a list of at least 30 air toxics that pose the greatest potential health threat in urban areas. As a result, EPA identified a list of 33 air toxics to target. The CAA also required EPA to identify and list the area source categories responsible for 90% of the emissions of the 33 listed air toxics and subject them to standards defined under the CAA (section 112(d)). To date, they have identified 70 area source categories that contribute to the emissions of these 33 pollutants. Of those 70 categories, 16 are now regulated and the remaining rules are under development or will be developed in the future. The Strategy also identifies the need for further studies of mobile and indoor sources in urban environments. EPA was put on a court order schedule in March 2006 to issue the area source rules listed under the Urban Air Toxics Strategy.

"Area sources" are those sources that emit less than 10 tons annually of a single hazardous air pollutant or less than 25 tons or more annually of a combination of hazardous air pollutants, with "major sources" emitting more than these amounts.


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Hub Last Updated: 9/24/2012