This pie chart shows which toxic chemicals were released to air in the greatest quantities in 2015.

• Air releases of ammonia are largely due to the manufacture of nitrogen fertilizers in the chemicals industry and have remained relatively constant since 2005.
• Air releases of methanol are primarily from pulp and paper mills and have decreased by 31% since 2005.
• The majority of air releases of hydrochloric acid and sulfuric acid result from generating electricity from fossil fuels. Air releases of these two chemicals have decreased consistently since 2005.

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This page was published in January 2017 and uses the 2015 TRI National Analysis dataset made public in TRI Explorer in October 2016.

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