Air pollution is still the next big public-health crisis. 4.2 million people die each year from air pollution https://www.who.int/airpollution/en/ https://www.w

Air pollution is still the next big public-health crisis. 4.2 million people die each year from air pollution https://www.who.int/airpollution/en/ https://www.who.int/airpollution/en/.