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Time series comparison of pre- and post-lockdown for German cities

In general all graphs show that the mean NO2 concentration after the lockdown date has decreased – at some stations the effect is larger than at others. Concentration peaks with similar amplitudes, compared to before the lockdown, persist. The overall patterns would require a more detailed analysis of the locations e.g. considering mobility behaviour.

Cities at the Forefront of Air Quality: Interview with Karim Tarraf, CEO of Hawa Dawa

In the days of Covid-19, “air quality” is a topic in the media, too. Municipalities are often pioneers in pushing for improvements. Decisions must be made in complex social contexts and measures must be integrated into larger plans. Here’s an interview with Karim Tarraf, CEO of Hawa Dawa, in which he comments on the following topics:
How can the increasing importance of air quality data be explained?
Why are the available measurements and data usually insufficient?
What does cooperation with municipalities look like?

See the full picture: There is less net of the improvement in air quality through measures to curb the Covid-19 virus

Although measures to curb the Corona virus have (almost) brought many polluters to a standstill, the effects on the trends from measurements are not as obviously visible as some may have expected. In principle, when studying cause-and-effect relationships in the field of air quality, comprehensive interactions between the pollutants, their sensitivity to other environmental influences (e.g. weather, temperature, wind) as well as eco-sociological influences must always be taken into account.

What we should learn for air quality from measures to curb the Corona virus

In his article published in Ends Europe, Richard Weyndling cites European experts as well as health and environmental activists who agree that the impact of Covid-19 restrictions on air quality in Europe demonstrates the case for tougher action on pollution. Among others, Zoltan Massay-Kosubek from the European Health Authority is quoted: “Although stopping most transports from one day to the next is not an appropriate way to reduce pollution, we must avoid, returning to the same pre-crisis levels of pollution once the epidemic has ended.”