Paris traffic zone improves air quality
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Airparif, an air quality monitoring group in the Paris region of France, found that a limited traffic zone decreased road traffic within the city between 2023 and 2025, especially in the zone covering the first four arrondissements, a 18% reduction.
The zone restricts cars from passing through without stopping, except for valid reasons. Traffic decreased by 12% to 10% in areas further from the city center.
This reduction in traffic corresponded with an average drop of approximately 1 microgram per cubic meter of nitrogen dioxide (NO2) across Paris. Airparif’s initial assessment of the zone revealed notably better air quality on roads directly affected by the traffic reduction, such as Boulevard Morland, where NO2 levels fell by 2 to 5 micrograms per cubic meter. While traffic shifted to streets bordering the zone. Boulevards Bonne-Nouvelle and Saint-Germain saw increased traffic.
Airparif reports this did not worsen air quality because of the overall effect of the zone. The city of Paris launched the zone in November 2024 in a “learning phase” and has not yet issued fines to those who violate the restrictions.
