Air Conservation Commission
The Joplin Globe, Febuary 7, 2008, reported that the Air Quality Commission discussion included a proposal that would lower the threshhold to a 4-to-1 ratio, triggering additional state oversite, but odors would have to register 7-to-1 or above to trigger a violation. The Attorney General's office recommended lowering the state's air dilution standard to 2-to-1 from 7-to-1, along with a technology-based approach. The Missouri Department of Natural Resources (MDNR) proposed a new protocol that measures intensity, rather than just checking to see if it reaches the 7-to-1 ratio.
Here is the Odor Workgroup Report to the Missouri Air Conservation Commission, dated July 2007.