The confinement, from March 17 to May 11, 2020, had an indirect positive impact in the capital. A drop in air pollution would have helped to reduce the number of premature deaths.
“We were able to count particles larger than 0.2 micrometers in diameter up to an altitude of 300 meters in the air column above Parc André Citroën in Paris using the Generali balloon, explains Jean-Baptiste Renard, researcher at the environmental and space physics and chemistry laboratory of the CNRS, in Orléans. The day after confinement, there was a marked drop in the total number of particles measured in the air. We then noted a 40% drop in the number of these very fine particles, due to a sudden stop in road traffic “.
AirParif, the association that measures air quality in Île-de-France, has a slightly different record. “During confinement, we measured a 30% decrease in ultrafine particles (PM 0.1), and a 7% decrease in fine particles