Comparison of nitrogen dioxide emissions in North America between March/April 2019 and 2020
The situation in North America between mid-March and April is similar to that in Europe on a year-on-year basis. Here, the reduction of tropospheric nitrogen dioxide on the east coast and especially in the region around New York is of the order of 30 percent. The weather-related fluctuations were reduced by creating monthly averages. These averages were calculated over the period from 16 March to 15 April. No adjustments for the influence of the weather on the combination of long-term satellite observations, in-situ measurements and model calculations were made – as described in the text.