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TRI National Analysis

Air Releases by Chemical & Industry

This pie chart shows which TRI chemicals were released to air in the greatest quantities during 2017.


Note: Percentages may not sum to 100% due to rounding.

  • Facilities manufacturing nitrogen fertilizers accounted for about one third of the air releases of ammonia reported to TRI for the past five years.
  • Air releases of methanol are primarily from pulp, paper, and paperboard mills and have decreased by 24% since 2007.
  • Thirty-four percent of hydrochloric acid and 79% of sulfuric acid emissions result from generating electricity from combustion of coal and oil. Air releases of these two chemicals reported to TRI have decreased consistently since 2007. One reason for the decrease in air releases of these chemicals is the increase in the use of natural gas as a fuel for electricity generation. Natural gas power plants are not required to report to TRI.

This pie chart shows the TRI-covered industry sectors that reported the greatest releases of TRI chemicals to air during 2017.


Note: Percentages may not sum to 100% due to rounding.

  • Chemical manufacturing, paper manufacturing, and the electric utility sectors accounted for the greatest releases to air in 2017. Air releases in these three industries have decreased since 2016:
    • Chemicals: 4% decrease (7.1 million pounds)
    • Paper: 2% decrease (2.5 million pounds)
    • Electric utilities: 5% decrease (4.4 million pounds)

This page was published in March 2019 and uses the 2017 TRI National Analysis dataset made public in TRI Explorer in October 2018.

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