Bangkok Fights Air Pollution With Water-Spraying Drones (qz.com)

An anonymous reader quotes a report from Quartz: Earlier in the week, levels of PM2.5 -- tiny particles 2.5 microns in diameter or smaller that can penetrate deep into the lungs -- reached 185 micrograms per cubic meter. Anything above 150 is deemed hazardous for all individuals (50 or below is considered good). The government has responded by unleashing a small fleet of drones that can spray water into the air and eliminate some of the pollution. Photos from a test on Tuesday (Jan. 22) show the yellow aircraft dispensing water and a "non-hazardous chemical spray," reported the Bangkok Post. An official from the Defense Technology Institute, a government agency, said the test, in which drones sprayed for less than an hour, reduced the concentration of PM2.5 by 10 micrograms per cubic meter on average.