After a 16-year review, EPA is recommending [1]that it begin requiring polluters to report their releases of hydrogen sulfide [2]. Hydrogen sulfide can be released from factory farms, wastewater treatment plants, oil and gas operations, and other human activities. The public may comment on the proposal here [3].
Links:
[1] http://www.epa.gov/tri/lawsandregs/hydrogensulfide/Hydrogen Sulfide.pdf
[2] http://www.atsdr.cdc.gov/tfacts114.pdf
[3] http://www.regulations.gov/search/Regs/home.html#submitComment?R=0900006480aaf30f