On April 29, 2010, the EPA announced two proposed air toxics standards: (1) an amendment to emission guidelines and new source performance standards, and (2) proposed new rules to clearly define and identify solid and non-solid, non-hazardous secondary materials.

The two air toxic standards will affect emissions from industrial, commercial, and institutional boilers and process heaters. One is written for major source facilities, which are those that emit or have the potential to emit 10 or more tons per year of any single air toxin or over 25 tons per year of any combination of air toxins. The second is for area source facilities that emit less than 10 tons per years of a single air toxin or less than 25 tons of any combination.

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