Fig. 4: Diagram of impacts of meteorology and emission reductions on the ozone concentration in the YRD region during COVID lockdown. | npj Climate and Atmospheric Science

Fig. 4: Diagram of impacts of meteorology and emission reductions on the ozone concentration in the YRD region during COVID lockdown.

From: Seasonality and reduced nitric oxide titration dominated ozone increase during COVID-19 lockdown in eastern China

Fig. 4

The meteorology effects dominate the increase of both O3 and Ox concentrations. The emission reduction doesn’t lead to a fast chemical production of O3, but rather a reduced production. The increase of O3 is mainly driven by a greater reduction in the chemical loss of O3 via NO titration processes.

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