Air pollution in China is characterized by high concentrations of PM_2.5 and ozone.With the implementation of the Action Plan for Air Pollution Prevention and Control issued by the State Council in 2013,concentrations of PM_2.5 have been decreasing but those of ozone show increasing trends.Concentrations of PM_2.5 and ozone are still far higher than the air quality standards recommended by the World Health Organization.For the formation of air pollutants,while emissions are the fundamental causes,meteorological conditions are the external drivers that affect transport,chemical reactions,dry and wet deposition of air pollutants.A systematic understanding of the impacts of weather and climate on air pollutants is essential for prevention of severe pollution events and for long-term air quality planning.This paper summarizes China's recent research progress on the roles of weather and climate in the formation of PM_2.5 and ozone.Currently,substantial progress has been made with respect to the impacts of weather and climate on PM_2.5,especially the connections between climate factors,regional circulation patterns,and the local stagnant conditions for high PM_2.5 levels.However,less attention has been paid to the impacts of weather and climate on ozone.The research priorities in this field are highlighted in the conclusion section.

PM_2.5  /  O₃  /  atmospheric contamination  /  weather  /  climate