Hawa Dawa adds the interactive analysis tool ‘traffic reports’ to the premium dashboards Plus and Pro. This provides city and traffic planners with detailed information on the correlation of traffic volume, fleet composition and vehicle speed with the measured pollutants.
Hawa Dawa offers a new regular report on compliance with legal limit values, which compares the current measured values with the legal requirements in a comprehensive manner and presents trends per measuring station and air pollutant.
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 worldwide have been imposing lockdowns due to coronavirus, leading to traffic reductions and related to that, less NO2 pollution. The strength of the effect is not the same everywhere, being dependent on a number of variables, such as pollution levels and amount of traffic before the lockdown at the particular location, fleet composition, weather conditions and topography and urban architecture. Furthermore, the measures defining the “lockdown” were not the same everywhere and were also implemented with different levels of rigour. Without analyzing in-depth the factors at play at different places across the world, here just a few examples of what the change in NO2 pollution looked like in a few cities:
