According to Airparif, which screens air air pollution in Île-de-France, the focus of high-quality particles has dropped by 55 % and that of nitrogen dioxide of fifty % during the last twenty years.
https://www.france24.com/fr/france/20250409-l-instant-la-pollution-de-l-air-divis%C3%A9e-par-deux-en-vingt-ans-en-%C3%AEle-de-france
The second +: air air pollution divided by two in twenty years in Île-de-France | EUROtoday
