Warsaw clean‑transport zone cuts NO₂ levels by 18% in two years

Data from Warsaw’s Office for Air Protection and Climate Policy show that average nitrogen‑dioxide (NO₂) concentrations on monitoring stations inside the city's Clean‑Transport Zone fell by about 18 % between 2023 and 2025. Stations outside the zone recorded a much smaller decline of roughly 5 % over the same period. The zone, which restricts the most polluting vehicles from the city centre, is intended to protect public health, especially for children, seniors, pregnant women and residents of busy streets. Health experts note that long‑term exposure to NO₂ increases the risk of asthma, cardiovascular disease, strokes, respiratory infections and premature death. The sharper drop inside the zone suggests reduced exposure for inhabitants, although officials caution that weather, traffic volume, fleet renewal and other measures also influence air quality. Continued monitoring will be needed to isolate the zone’s specific impact from these factors.