When a heatwave settles over eastern China, the air does not simply feel hotter — it becomes chemically more dangerous. Surface ozone, the corrosive pollutant responsible for summer smog, climbs steadily as temperatures rise, and a new study of the Yangtze River Delta reveals that the reasons behind that climb are strikingly different in a megacity compared with the forested countryside nearby. The research, published in Atmospheric Chemistry an…
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