Aerial pollutants emitted from animal feeding operations (AFOs) include ammonia (NH3), hydrogen sulfide (H2S), methane (CH4), and particulate matter (PM) (NRC, 2003). Due to the significant impact on public health and environment, the AFO emissions may come under regulation by federal laws or government policies (USEPA, 2009).

Proper measurement and estimation of aerial pollutant emissions from AFOs is an important issue for policy makers, regulators, producers, and environmental scientists. The emission models were developed to estimate emissions of NH3, H2S, and PM10 for typical commercial swine farms. The empirical emission models were based on 2-year datasets of the National Air Emissions Monitoring Study (NAEMS), which consisted of continuous emission measurements at swine farms. The models were developed using regression following standard model evaluation guidelines.

This interactive website aims to provide public access (e.g. students, policy makers, farmers, and researchers) to estimate pollutant emission rate from a livestock facility. The emission models provide daily and annual rates and figures for NH3, H2S, and PM10 based on study result. The model outputs provided is the average daily mean emission rates in various units, including lb/d/barn and mg/d/hd.

These models were developed based on the emission data from Indiana and North Carolina, please refer to the specifications at these sites for a valid emission calculation.


To learn more about the emission dataset, please click here.



NRC. 2002. The scientific basis for estimating emissions from animal feeding operations. Ad Hoc Committee on Air Emissions from Animal Feeding Operations, Committee on Animal Nutrition, Board on Agriculture and Natural Resources [and] Board on Environmental Studies and Toxicology, Division on Earth and Life Studies, National Research Council of the National Academies. The National Academies Press, Washington, D.C.

USEPA. 2009. Animal feeding operations air compliance agreement frequently asked questions. Washington, D.C. : U.S. Environmental Protection Agency, Office of Civil Enforcement. Available at: Accessed 30 January 2011.

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