Air pollution has reached hazardous levels in Bangkok, Thailand, leading some officials to attempt an unusual approach: letting drones spray the pollution out of the sky. 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).
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