#Size matters in air pollution—but it’s not enough
“#Size matters in air pollution—but it’s not enough” Air pollution standards currently focus on the mass concentration of particles smaller than 10 micrometres in diameter (PM10) or smaller than 2.5 micrometres (PM2.5). Credit: Panek/Wikimedia, licenced under CC BY-SA 4.0 Current regulations on air pollution mainly focus on the mass of particles of a particular size…