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Other Air Emissions

Marathon tracks U.S. criteria pollutants including oxides of nitrogen (NOx) and sulfur (SOx), volatile organic compounds (VOCs), carbon monoxide (CO) and particulate matter (PM). Global NOx, SOx and VOCs are reported here.

Criteria pollutant emissions are reported one year in arrears due to regulatory reporting deadlines.

  • Downstream emissions decreased 18 percent from 2005-2009 due to the installation of control devices at seven refineries in compliance with an EPA Consent Decree, and we do not expect further significant reductions.
  • Upstream criteria pollutant emissions exclude North America Production Operations. Upstream VOC emissions increased 114 percent in 2009 due to adding U.K. venting operations to the inventories and a full year of operation in Norway.