Response of particle number concentrations to the clean air action plan: lessons from the first long-term aerosol measurements in a typical urban valley in western China
Key Laboratory of Land Surface Process and Climate Change in Cold and
Arid Regions, Northwest Institute of Eco-Environment and Resources, Chinese
Academy of Sciences, Lanzhou 730000, China
Pingliang Land Surface Process & Severe Weather Research Station,
Pingliang, 744015, China
Gansu Land Surface Process & Severe Weather Observation and
Research Station, Pingliang, 744015, China
State Key Laboratory of Cryospheric Science, Northwest Institute of
Eco-Environment and Resources, Chinese Academy of Sciences, Lanzhou 730000,
China
Ye Yu
Key Laboratory of Land Surface Process and Climate Change in Cold and
Arid Regions, Northwest Institute of Eco-Environment and Resources, Chinese
Academy of Sciences, Lanzhou 730000, China
Pingliang Land Surface Process & Severe Weather Research Station,
Pingliang, 744015, China
Gansu Land Surface Process & Severe Weather Observation and
Research Station, Pingliang, 744015, China
Jianglin Li
Key Laboratory of Land Surface Process and Climate Change in Cold and
Arid Regions, Northwest Institute of Eco-Environment and Resources, Chinese
Academy of Sciences, Lanzhou 730000, China
Pingliang Land Surface Process & Severe Weather Research Station,
Pingliang, 744015, China
Gansu Land Surface Process & Severe Weather Observation and
Research Station, Pingliang, 744015, China
Daiying Yin
Key Laboratory of Desert and Desertification, Northwest Institute of
Eco-Environment and Resources, Chinese Academy of Sciences, Lanzhou 730000,
China
University of Chinese Academy of Sciences, Beijing 100049, China
Shaofeng Qi
Key Laboratory of Land Surface Process and Climate Change in Cold and
Arid Regions, Northwest Institute of Eco-Environment and Resources, Chinese
Academy of Sciences, Lanzhou 730000, China
University of Chinese Academy of Sciences, Beijing 100049, China
Dahe Qin
State Key Laboratory of Cryospheric Science, Northwest Institute of
Eco-Environment and Resources, Chinese Academy of Sciences, Lanzhou 730000,
China
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We found a large PM2.5 reduction in response to Clean Air Action (CAA), but impacts of CAA on particle number concentrations (PNCs) may be different from PM2.5 mass due to newly formed particle impacts. The k-means clustering technique and Theil–Sen regression were used to analyze PNCs variations and to quantify their trends. Increased daytime solar radiation, higher temperature and lower RH at noon induced by reduced PM2.5 mass promoted formation of new particles and increased particle numbers.
We found a large PM2.5 reduction in response to Clean Air Action (CAA), but impacts of CAA on...
