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Reghaïa, nestled within the Boumerdes Province of Algeria, occupies a geographically significant position along the Mediterranean coastline. Located at coordinates 36.7631, 3.3426, the city benefits from a relatively mild coastal climate, but its proximity to the Tell Atlas mountains introduces complex topographical influences on air quality. Reghaïa isn’t a sprawling metropolis; with a population of approximately 66,215, it exhibits a transitional urban-rural character. The terrain is undulating, rising gently inland towards the foothills, creating localized microclimates and potential for pollutant trapping during temperature inversions. The Mediterranean Sea exerts a moderating influence, providing sea breezes that can disperse pollutants, but also contributing to humidity and potential for saline aerosols. Surrounding Reghaïa are agricultural lands, primarily focused on citrus fruits and olive groves, alongside smaller-scale industrial activity concentrated around Boumerdes city itself. This mix of agricultural practices (potentially involving fertilizer use and burning of agricultural waste) and industrial emissions contributes to the local pollution profile. The urban-rural gradient is fairly sharp, with agricultural areas immediately bordering the city limits. This proximity means pollutants from agricultural sources can readily impact Reghaïa’s air quality, particularly during harvest seasons. The city’s location within a coastal plain also makes it vulnerable to dust storms originating from the Sahara Desert, further impacting air quality.

Reghaïa’s air quality follows a distinct seasonal pattern, heavily influenced by meteorological conditions. Summer (June-August) often sees relatively cleaner air, driven by prevailing northerly winds that sweep across the Mediterranean, dispersing pollutants. However, high temperatures can exacerbate ozone formation, a secondary pollutant. Autumn (September-November) brings a transition period, with decreasing wind speeds and the potential for temperature inversions, trapping pollutants closer to the ground. This is often when agricultural burning of crop residue occurs, significantly degrading air quality. Winter (December-February) is typically the period of poorest air quality. Reduced sunlight and stable atmospheric conditions lead to pollutant accumulation, and increased use of heating fuels contributes to particulate matter concentrations. Dust storms from the Sahara are also more frequent during these months. Spring (March-May) sees a gradual improvement as temperatures rise and winds become more frequent, but the risk of dust storms remains. Sensitive groups – children, the elderly, and those with respiratory conditions – should limit outdoor activity during winter and periods of high dust concentration. Avoiding strenuous activity during peak agricultural burning in autumn is also advisable. Monitoring local weather patterns and air quality reports is crucial for informed decision-making throughout the year.