Overview
- The Préfecture de police announced on Thursday that circulation différenciée will run from midday May 28 until Saturday night inside the A86, allowing only vehicles with a Crit'Air 0, 1 or 2 sticker to drive in the zone.
- Speed limits will be cut by 20 km/h on motorways and set at 70 km/h on affected national and departmental roads, and heavy goods vehicles over 3.5 tonnes must use the rocade francilienne to bypass the restricted area.
- The emergency plan requires temporary suspension of the most polluting industrial activities and the postponement of maintenance work that emits volatile organic compounds to cut ozone precursors.
- Health authorities say ozone forms from NOx and VOCs under strong sunlight and can irritate airways; the 180 µg/m3 threshold triggers public information and advice for people with asthma or other respiratory conditions.
- Prev'Air reports similar exceedances in Normandie and Hauts-de-France and notes a possible improvement from Sunday that remains uncertain, so officials may extend or adapt measures depending on new forecasts.