Police don’t share schedules of planned raids. Yet America’s Environmental Protection Agency (EPA) does not seem convinced of the value of surprise in deterring bad behavior. Every year it publishes a list of dates, spaced at six-day intervals, on which it will require state and local agencies to provide data on concentrations of harmful fine particulate matter (pm2.5), such as soot or cement dust…
A new paper by Eric Zou of the University of Oregon makes use of satellite images to spy on polluters at times when they think no one is watching. NASA, America’s space agency, publishes data on the concentration of aerosol particles—ranging from natural dust to man-made toxins—all around the world, as seen from space. For every day in 2001-13, Mr Zou compiled these readings in the vicinity of each of America’s 1,200 air-monitoring sites.
Although some stations provided data continuously, 30-50% of them sent reports only once every six days. For these sites, Mr Zou studied how aerosol levels varied based on whether data would be reported. Sure enough, the air was consistently cleaner in these areas on monitoring days than it was the rest of the time, by a margin of 1.6%. Reporting schedules were almost certainly the cause….The size of this “pollution gap” differed by region. It was biggest in parts of Appalachia and the Midwest with lots of mining, and in the northern Mountain West, where paper and lumber mills are common.
The magnitude of the gap also depended on the cost of being caught. Every year, the EPA produces a list of counties whose average air quality falls below minimum standards. The punishments for inclusion are costly: factories become subject to burdensome clean-technology requirements, and local governments can be fined. When firms risked facing sanctions, they seemed to game the system more aggressively. In counties that exceeded the pm2.5 limit in a given month, the pollution gap in the following month swelled to 7%. In all other cases, it was just 1.2%….
Excerpts from Poorly devised regulation lets firms pollute with abandon: We Were Expecting you, Economist, Sept. 4, 2021