Sulfur Dioxide (SO2)
Sulfur dioxide is a gas or liquid that results from burning fuel with sulfur in it. Common sources include:
It increases symptoms in people with asthma and irritates the respiratory system.
National Ambient Air Quality Standard (NAAQS) for Sulfur Dioxide
In 2010, EPA adopted a more protective sulfur dioxide standard of 75 parts per billion averaged over 1 hour. We evaluated the levels of SO2 in the air in Washington’s 36 counties and sent to EPA our recommendation and response to public comment about how each area is meeting the standard. Ecology's recommendation for designation:
* The annual and 24-hour SO2 standards will no longer apply in a specific area one year after EPA has designated an area in attainment for SO2.
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