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Adipic Acid Production. Reported emissions from the adipic acid production subsector have varied greatly between 2011 and 2019, with the highest emissions in 2011 and 2018 (11.9 MMT CO₂e). Between 2018 and 2019, the emissions from adipic acid production decreased by 41.8 percent (5.0 MMT CO₂e). This change is due to one facility that employs a nitrous oxide abatement device but varies the percent of time that the device is in service. The higher the percentage of time that the abatement device is in service, the lower the nitrous oxide emissions. This facility has acknowledged the variation in emissions is due to the nitrous oxide abatement device and has verified that the emissions are correct.

Ammonia ProductionManufacturing. While somewhat variable from year to year, reported emissions from ammonia production manufacturing increased by 41.3 percent (10.3 MMT CO₂e) from 2011 to 2018. This is mostly due to an increase in the number of ammonia production manufacturing facilities, from 22 in 2011 to 29 in 2019. New ammonia production manufacturing facilities were opened in 2013, 2016, and 2017 (one in 2013, four in 2016, and two in 2017). For 2018 and 2019, the number of facilities did not change from 2017. There was a slight decrease in emissions of 1.7% (0.62 MMT CO₂e) from 2018 to 2019 with minimal impact to the overall emissions from the non-fluorinated chemicals sector.

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