Recent research in the USA has revealed that air pollution from coal power plants was around twice as dangerous as previously thought, meaning that the introduction of air quality regulations and coal power plant retirements has been twice as beneficial as expected.
Today marks the first day of the season on which the Bay Area Air Quality Management District has felt it necessary to announce a Spare the Air Alert for fine particle pollution in San Francisco, a move which bans people from burning wood while the alert is in place.