Paris traffic restrictions show impact on air quality

A study by Airparif indicates that the implementation of a Limited Traffic Zone (ZTL) in central Paris has contributed to improved air quality across the capital. Since its launch in late 2024, nitrogen dioxide (NO2) concentrations have seen an average decrease of approximately 1 µg/m3 citywide.

Within the ZTL, which covers the first four arrondissements, road traffic decreased by 18% between 2023 and 2025. Specific areas, such as Boulevard Morland, saw traffic reductions of up to 40%, leading to significant drops in NO2 levels. While some peripheral roads experienced increased traffic due to diversions, Airparif noted that this did not result in a degradation of air quality due to the overall effect of the zone.

However, a separate study by INSEE suggests that Low Emission Zones (ZFE) generally have a limited impact on air quality improvement. The report notes that while these zones help reduce emissions from the vehicle fleet, the effect is marginal compared to the broader trend of natural vehicle fleet renewal. The ZFE policies have also faced significant political scrutiny in France, facing accusations of being socially inequitable and punitive.