Recently installed, the air quality monitoring station set up by Gwad'Air in Quartier d'Orléans measured a peak in air pollution in fine PM10 particles, of the order of 91 µg / m3, thus triggering the red alert level for the days of Thursday and last Friday.

On Friday, the concentration of PM10 fine particles exceeded 80 µg / m3 over 24 hours, a value which corresponds to the regulatory alert threshold. Thus, the Quartier d'Orléans station measured a value of 16 µg / m0 for Thursday at 91:3 p.m., falling on Friday with a measurement of 80 µg / m3 at noon. Faced with this situation, the alert procedure was maintained by the prefecture of Saint-Martin and Saint-Barthélemy. This air pollution is caused by fine particles less than 10 micrometers in diameter (PM10) and is mainly linked to the passage of sand mists over the entire Guadeloupe archipelago. But human activity, such as the burning of fossil fuels, means of transport, industrial activities, etc., are also the source of this pollution.

However, the forecast for Saturday, communicated at 12 noon, considered that the risk of overshoot was rather low for the day of Saturday and the days to come. According to Gwad'Air, the alert threshold corresponds to a level of concentration of pollutants in the atmosphere above which a short-term exposure poses a risk to human health or to environmental degradation justifying the intervention of emergency measures. _RM

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