Pollution: the Alpes-Maritimes department moves to alert level 1 tomorrow

A mass of air loaded with desert particles from the Sahara is causing a marked increase in fine particle concentrations on the Maralpin coast. The prefecture triggers the “Information-Recommendations” procedure for May 27 and level 1 alert for May 28, due to a persistent risk of exceeding the regulatory threshold for PM10.

Measurements taken on May 26 show a clear increase in fine particles, linked to the passage of a desert cloud and the accumulation of local emissions. The Alpes-Maritimes Prefecture clarifies that “fine particle levels exceeded the information-recommendations threshold yesterday in several regions of northwestern France.” In Nice Arson, the information threshold was exceeded, leading to enhanced vigilance on the coastal strip.

The “Information-Recommendations” procedure applies for May 27. Level 1 alert is activated for May 28 due to the “persistence of threshold exceedance”. The affected departments are Alpes-Maritimes, Alpes-de-Haute-Provence and Hautes-Alpes.

Health recommendations emphasize avoiding intense physical activity, limiting travel on main roads during peak hours and maintaining daily ventilation of homes. The Alpes-Maritimes prefecture stresses that “the harmful effects of air pollution accumulate day after day.”

Level 1 alert also triggers additional measures: reduction of 20 km/h of maximum authorized speeds, electrical connection of ships at berth when facilities allow, suspension of non-efficient combustion appliances and postponement of work using organic solvents. Agricultural spreading and open-air burning must also be deferred.

Health recommendations and emission reduction measures

Vulnerable and sensitive populations are encouraged to reduce physical exertion, to favor short outings and to seek medical advice in case of respiratory or cardiac discomfort. Non-essential travel can be postponed, with encouragement for carpooling and public transport. Active modes remain recommended for short trips.

The residential, agricultural and industrial sectors are subject to temporary restrictions. Non-efficient wood or coal combustion appliances must be shut down. Soil work, spreading and burning operations are postponed. Classified facilities must apply the prescribed requirements in alert situations.

The prefecture and AtmoSud recall that air quality remains degraded due to high levels of ozone and particles. The situation could persist depending on the evolution of the Saharan air mass.