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Aïn el Bya, nestled within the Oran province of Algeria, occupies a geographically significant position in the country’s northwest. Located at coordinates 35.8167°N, -0.2833°W, the city benefits from a Mediterranean climate but is also subject to regional variations due to its terrain. The landscape surrounding Aïn el Bya is characterised by rolling hills transitioning into the Tell Atlas mountain range to the south, and a relatively flat coastal plain extending towards the Mediterranean Sea to the north. This proximity to the sea influences local weather patterns, providing some degree of atmospheric dilution, but also creating conditions for humidity and potential fog. The city’s elevation, though not extreme, contributes to localised temperature inversions. Aïn el Bya is situated within an agricultural zone, with surrounding lands dedicated to cereal crops and vineyards, and is increasingly influenced by the industrial activity concentrated around the larger city of Oran. The urban-rural gradient is relatively sharp, with agricultural land immediately bordering the city limits. This proximity to both agricultural practices (potential ammonia emissions from fertilizers) and industrial zones (potential particulate matter and nitrogen oxides) directly impacts local air quality, creating a complex pollution profile. The prevailing winds, generally from the west, carry pollutants from Oran towards Aïn el Bya, exacerbating the situation.

Air quality in Aïn el Bya follows a distinct seasonal pattern, heavily influenced by meteorological conditions. Summer (June-August) often sees a slight improvement in air quality due to stronger sea breezes aiding dispersion, though high temperatures can promote ozone formation. However, increased agricultural activity during harvest season can lead to localised dust and ammonia spikes. Autumn (September-November) brings a transition period, with decreasing temperatures and potential for temperature inversions trapping pollutants, particularly from Oran’s industrial areas. This is often a period of increased particulate matter. Winter (December-February) is typically the most challenging period for air quality. Weak winds and frequent temperature inversions create stable atmospheric conditions, allowing pollutants to accumulate. Rainfall is also more frequent, which can temporarily cleanse the air, but also leads to increased humidity and potential for damp-related respiratory issues. Spring (March-May) sees a gradual improvement as temperatures rise and winds become more consistent. However, dust storms originating from the Sahara Desert can occasionally impact air quality. Sensitive groups – children, the elderly, and those with respiratory conditions – should be particularly cautious during winter and autumn. Avoiding strenuous outdoor activity during periods of calm weather is advisable. Monitoring local conditions and staying indoors when pollution is noticeable is crucial.