Egg Industry Center

Ammonia Emissions Reporting Reminder

November 10, 2017

As the November 15 potential deadline for ammonia emissions reporting for CERCLA (the Comprehensive Emergency Response Compensation and Liability Act) draws near for the US livestock and poultry industry, the Egg Industry Center reminds the industry of the egg production ammonia emission estimation tools it has developed.

“Our goals are a) to remind those who are assisting producers during this time that the tools are available, and b) to encourage producers to ensure they are using the most up-to-date version,” explains Dr. Hongwei Xin, Director of the Egg Industry Center and Distinguished Professor in Agriculture and Biosystems Engineering.

“When we first released the tools, we had lots of interest and questions on application to specific farm situations. Some of the adjustments we made have resulted in somewhat lower emission numbers than the original tools produced.”

All three estimation calculators have been updated since their original release in May 2017. “While it was overwhelming for a while fielding all the phone calls, we are thankful that we had those conversations which gave us an opportunity to clarify how to use the tools and enhance their accuracy,” said Xin.

The tools, and any subsequent updates, reside on the EIC website at and are housed in the EIC Research Library under the Environment topic area. However, during this crucial time, links to the tools can be found right on the center's homepage.

The tools include:

  • Layer Emissions Tool estimates the ammonia emissions based on housing type, inventory and manure storage system. (NOTE: Cage-free floor system barns with no manure removal system should use the high-rise housing style to calculate the emissions.)
  • Pullet Emissions Tool - Frequent Manure Removal estimates the ammonia emissions based on pullet age, daily manure removal from the house and weekly manure removal from the farm.
  • Pullet Emissions Tool - Long-term Manure Storage estimates the ammonia emissions based on pullet age, regular manure removal from the house and either no on-site manure storage or long-term on-site manure storage.

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