Ozone density poses challenges for China`s air pollution targets
(WorldNews China)

Expert says sharp increase last year a result of heat wave, drought conditions Despite an increase in ozone density across the country, safety hazards from the air pollutant are still `controllable` and `preventable`, environmental officials said. The harmful gas, however, has posed challenges for the country as it looks to realize its target for air pollution control. While the average density of the other major air pollutants either all declined or changed little in the 337 major cities across the country in 2019, the concentration of ozone went up by 6.5...