Animals and airspace.

Animal feeding operations (AFOs) are generating concerns over the possible health impacts of their emissions. In January 2005 the U.S. EPA announced a new public-private agreement to help characterize the air pollution created by the nation's approximately 450,000 AFOs. This measure establishes a two-year industry-funded emissions monitoring program to give federal agencies data to help shape appropriate AFO emission regulations. Pollutants to be monitored include particulate matter, hydrogen sulfide, volatile organic compounds, ammonia, and nitrogen oxides.