NASA has combined with Columbia University to produce a study (Geophysical Research Letters), which claims that fine particulate matter from food production creates as much PM2.5 pollution as all other human activities combined. Regulating Farm Dust U.S. EPA fought back hard against charges a few years ago that it was planning to regulate and stop dust blowing from farms. The agency was mocked by the agricultural sector for buffoonery. Now NASA has combined with Columbia University to produce a study (Geophysical Research Letters), which claims that fine particulate matter from food production creates as much PM2.5 pollution as all other human activities combined. However, regulating farm dust is now recognized as conceptually silly, and...