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Casablanca, nestled within Chile’s Región Metropolitana, occupies a geographically complex position that significantly influences its air quality. Situated at approximately -33.3167° latitude and -71.4167° longitude, the city lies within the Central Valley, a fertile agricultural region bounded by the Andes Mountains to the east and the Pacific Ocean to the west. This valley setting creates a natural funnel, potentially trapping pollutants under certain meteorological conditions. The surrounding landscape is dominated by rolling hills and vineyards, characteristic of the Casablanca Valley, renowned for its cool-climate wines. The urban fabric of Casablanca itself is a blend of residential areas, commercial zones, and industrial pockets, reflecting its role as a regional service and agricultural hub. The urban–rural gradient is relatively sharp, with agricultural land quickly transitioning to urban development. The proximity to the Pacific Ocean introduces a maritime influence, bringing moisture and occasionally, sea spray, which can impact particulate matter. Further inland, the presence of agricultural zones, particularly those utilizing fertilizers and pesticides, contributes to localized emissions. The elevation, while moderate, contributes to temperature inversions, especially during the cooler months, where cold air settles in the valley floor, preventing vertical mixing and trapping pollutants closer to ground level. Industrial activity, concentrated in nearby areas within the wider metropolitan region, also contributes to the overall air quality profile, with prevailing winds dictating the dispersal patterns.

Casablanca’s air quality exhibits a distinct seasonal pattern dictated by its Mediterranean climate. During the dry summer months (December to February), characterized by high temperatures and minimal rainfall, the risk of elevated pollution levels increases. Strong solar radiation promotes photochemical smog formation, as pollutants react in sunlight. The lack of precipitation means there's little natural cleansing of the atmosphere. Temperature inversions are also more frequent during this period, further exacerbating the problem. Spring (September to November) often sees improved air quality as winds increase and temperatures moderate, though agricultural burning practices can occasionally contribute to localized pollution events. Autumn (March to May) brings cooler temperatures and increased rainfall, generally leading to better air quality, although fog can trap pollutants near ground level. Winter (June to August) presents a mixed picture. While rainfall is more frequent, the cold temperatures and stable atmospheric conditions can lead to prolonged periods of stagnant air and increased particulate matter, particularly from residential heating and industrial emissions. Sensitive groups, including children, the elderly, and individuals with respiratory conditions, should exercise caution during the summer months and be mindful of potential fog events in autumn and winter. Outdoor activities are generally more favorable during spring and autumn, but it’s always advisable to monitor local air quality reports and adjust plans accordingly. The interplay of wind patterns, temperature fluctuations, and agricultural practices shapes the annual air quality cycle in Casablanca.