Read the full story at Chemical & Engineering News.
The air near large-scale industrialized pig, chicken, and dairy cow operations not only stinks, it can be hazardous to public health. But no one knows exactly what is in the air surrounding such facilities because the U.S. livestock industry has long been exempt from reporting hazardous air emissions under federal law. A 2017 court decision would have upset that status quo by requiring farmers and ranchers to report certain emissions from animal waste, such as ammonia and hydrogen sulfide, when released above certain thresholds. Congress stepped in last month to pass a bill that once again exempts many farmers and ranchers from reporting air emissions to federal authorities. It is now up to the states to determine how best to deal with air emissions from the livestock industry.