The intense heat experienced over the past several days is contributing to a deterioration in air quality in several major French cities. In the Île-de-France region, Lyon, and several other metropolitan areas, authorities have launched information and advisory campaigns in response to rising concentrations of ozone, an air pollutant particularly harmful to health.
Due to solar radiation and emissions from road traffic, ozone forms more rapidly during heat waves. Prefectures therefore recommend limiting car use, favoring public transport, and avoiding strenuous physical activity during the hottest hours of the day.
A growing health and economic risk
This pollution is no longer limited to a one-off summer problem. Episodes are becoming more frequent, earlier in the season, and are now affecting a growing number of areas. Health authorities remind the public that ozone can cause respiratory irritation, worsen certain cardiovascular conditions, and lead to an increase in medical consultations during pollution peaks.
Beyond the health consequences, these events also have an economic impact. Traffic restrictions, speed limits, and travel disruptions affect the activity of major metropolitan areas. Faced with a phenomenon exacerbated by climate change, local authorities are forced to adapt their mobility and air quality policies to better protect the most vulnerable populations.
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