France: ozone pollution diverts Paris HGV traffic and restricts older trucks in Lyon

From 26 May 2026, France's ongoing heatwave pushed ozone concentrations above the 180 µg/m³ information-recommendation threshold across Île-de-France and the Rhône valley. The Paris police prefecture formally recommended that HGVs over 3.5 tonnes in transit bypass central Paris via the Périphérique, while the Rhône prefecture activated orange-alert Crit'Air restrictions that barred older trucks from Lyon's low-emission zone. Restrictions were lifted at midnight on 27–28 May for the Rhône basin and are expected to clear across Île-de-France by 28 May.

What the restrictions meant for HGVs

Under France's pollution-alert protocol, motorway speed limits drop by 20 km/h when ozone thresholds are breached. On the A1 and A6 the limit fell from 130 to 110 km/h; on the Périphérique from 80 to 70 km/h. HGVs over 3.5 tonnes are already governed to a 90 km/h maximum on motorways, so the speed cuts did not add a new ceiling for trucks on the open autoroute network. The meaningful constraint for freight was different: the Paris police prefecture issued a formal recommendation that HGVs in transit — those not making a delivery inside the capital — use the Périphérique or outer orbital routes to avoid the most congested central sections of the network during the alert window (06:00–22:00).

Diesel vehicles classified Crit'Air 3 and below were also subject to access restrictions in Paris's designated low-emission zones during the alert. Foreign-registered HGVs without a French Crit'Air sticker are categorised as non-classé and fall under the same restrictions. Operators running older Euro III or Euro IV diesel trucks without a sticker faced potential fines if caught inside a restricted zone.

Rhône corridor: access maintained, but Lyon LEZ restricted older trucks

The A7 motorway — the principal north–south freight spine through the Rhône corridor — remained fully open to all HGV traffic throughout the alert. The restrictions activated by the Rhône prefecture applied specifically to the Lyon métropole's Zone à Faibles Émissions (ZFE-m). Under orange-alert rules, Crit'Air 3 vehicles and below — broadly, trucks registered before 2006 meeting only Euro IV standards or older — were barred from the ZFE perimeter. Crit'Air 1 and 2 trucks (Euro V and Euro VI, registered from 2006 onward with SCR or DPF systems) circulated without restriction.

The Rhône alert was declared by the prefecture covering the Lyon basin and the Coteaux zone on 26 May and was rescinded at midnight on 27–28 May. Lyon Mag reported speed reductions of the same magnitude as Île-de-France, and local monitoring confirmed ozone levels exceeded thresholds for two consecutive days before conditions improved.

What operators should keep in mind as heat continues

The European heatwave that caused these alerts — documented in our earlier post on the May 2026 heat dome — is not yet fully over. France's Météo-France forecasts elevated temperatures continuing through early June, and ATMO networks have flagged that any two consecutive days above 35°C in the Paris basin or Rhône valley can push ozone back above thresholds. Operators running older Crit'Air 3 or unclassified trucks through France should monitor Airparif (Île-de-France) and Atmo Auvergne–Rhône-Alpes in real time; both publish next-day forecasts by 17:00 each afternoon.

Carriers planning deliveries into Lyon city centre with older vehicles should obtain a French Crit'Air sticker before entering the ZFE-m regardless of alert status — the sticker is now a permanent LEZ requirement, not just a pollution-alert measure. The sticker costs €3.72 and must be displayed on the windscreen. If you need to route freight through the Rhône corridor or into the Paris metropolitan area and want help finding compliant carrier options, get a quote from Logifie .