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Fig. 1 | Ecological Processes

Fig. 1

From: Pandemic spotlight on urban water quality

Fig. 1

NO2 (nitrogen dioxide) in the tropospheric column (mol cm−2) for the first 14 days of spring 2019 (top) and 2020 (bottom), respectively, several weeks after many countries worldwide initiated lockdowns [maps generated with the Giovanni online tool (Prados et al. 2010) using data from the Ozone Monitoring Instrument on NASA’s Aura satellite, 30% cloud screened, daily 0.25° resolution]

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