Europe takes action to address weather-related ozone levels

This week the Mayor of London issued an alert for high ozone levels and similar alerts are being issued across Europe, but different countries are taking different approaches to dealing with the situation.

Geneva and Paris have both rolled out emergency measures to combat severe ozone pollution triggered by the ongoing heatwave across the continent.

In Geneva, public transport has been made free for the first time, with ticket checks suspended on buses, trams, trains and boats until air quality improves.

The move aims to persuade residents to leave their cars at home, cutting the nitrogen oxide emissions that contribute to ozone formation. Only lower-emission vehicles with environmental stickers are allowed into the city centre between 6am and 10pm and motorway speed limits have been reduced to 80km/h. Authorities are also advising residents to avoid strenuous outdoor activity during peak heat, not to smoke and to avoid wearing contact lenses if their eyes are irritated.

The Geneva measures coincide with a heatwave plan to protect vulnerable residents, particularly those over 65. Seniors are being offered free morning access to swimming pools and free afternoon cinema screenings in air-conditioned venues. A public map shows shaded or cool locations where at-risk groups can seek relief.

In the Paris region, the Prefecture of Police has imposed strict traffic restrictions after ozone levels were forecast to exceed the European health threshold of 180 µg/m³ today. Speed limits have been cut on all major roads, with motorway maximums reduced by up to 20km/h.

Lorries over 3.5 tonnes must avoid the region by using the outer ring road and open-air burning and certain industrial operations are being suspended. 

Both cities’ authorities say these interventions are aimed at reducing emissions and limiting health impacts until cooler weather and improved air circulation disperse the pollution. With temperatures in Switzerland topping 37°C and Paris under an orange heatwave alert, meteorologists warn that ozone levels could remain high for several days.