California Air Resources Board

The domestic ammonia category includes ammonia emissions from unspecified sources not included in other ammonia categories such as agricultural fertilizers or livestock husbandry. This methodology estimates emissions of ammonia (NH₃) resulting from these miscellaneous sources. This source category includes emissions from human respiration and perspiration, household ammonia usage, and volatilization of ammonia from pet and untreated human waste.

Recent Changes

Staff have updated several emission factors based on newly available studies. The most significant changes are to the emission factors for human respiration and perspiration, as well as pet waste. In addition, staff incorporated 2023 activity data.