Spatiotemporal changes in fine particulate matter and ozone in the oasis city of Korla, northeastern Tarim Basin of China.

Although the overall O 3 level in Korla is excellent, the proportion of O 3 class I showed a decreasing trend every year from 2016 to 2023, which may be due to an increase in atmospheric O 3 caused by the volatile organic compounds (VOCs) emitted from industrial activities and motorized vehicles accompanying the rapid development of the city 42 .

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The percentage of days with moderate and heavy pollution showed a trend of decreasing, then increasing, and then decreasing, while the percentage of days with severe pollution showed a slight decrease from year to year.

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