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Mijas is a uniquely bifurcated municipality situated within the province of Málaga in Andalusia, characterized by a dramatic transition from the rugged foothills of the Sierra Mijas to the shimmering shores of the Mediterranean. This duality defines its urban character, blending the whitewashed, traditional charm of Mijas Pueblo, perched high on a mountain slope, with the expansive, tourism-driven sprawl of Mijas Costa. The terrain is dominated by limestone ridges and steep gradients, which create a complex microclimatic environment. Geographically, the city acts as a corridor between the coastal plains and the interior mountains, meaning air quality is heavily influenced by the movement of maritime air masses. The proximity to the Alboran Sea provides a natural ventilation system through diurnal sea-land breezes, which generally help disperse urban pollutants. However, the elevation changes can lead to localized trapping of emissions in the lower coastal valleys during periods of atmospheric stability. While the region lacks heavy industrial belts, it is surrounded by intensive greenhouse agriculture and sprawling residential developments, introducing nitrates and particulate matter into the atmosphere. The urban-rural gradient is sharp, with the pristine air of the mountain peaks contrasting against the traffic-heavy corridors of the coast. This geographical positioning makes Mijas susceptible to long-range transport of pollutants, most notably the mineral dust originating from the Sahara, which frequently settles over the Andalusian landscape, temporarily degrading visibility and air quality across the entire southern Spanish coastline during specific seasonal events.

Air quality in Mijas follows a distinct Mediterranean cycle, driven by temperature shifts and wind patterns. In spring, the atmosphere is generally fresh, yet this period is frequently interrupted by "Calima" events. These are episodes where strong easterly winds transport massive quantities of Saharan dust across the Mediterranean, causing spikes in particulate matter that can linger for days. Summer brings intense heat and high solar radiation, which catalyze the formation of ground-level ozone, particularly along the congested coastal roads of Mijas Costa. During these scorching months, the sea breeze provides some relief, but the stagnant air of mid-August often traps pollutants. Autumn marks a transition toward cleaner air as rainfall begins to scrub the atmosphere of suspended particles. Winter is typically the cleanest season, though the risk of temperature inversions increases. During these cold snaps, a layer of warm air can trap cooler, polluted air near the ground, particularly in the valley areas, potentially increasing concentrations of nitrogen dioxide from heating systems and vehicle exhaust. For sensitive groups, such as asthmatics or the elderly, the Calima episodes of spring and the ozone peaks of late summer are the most hazardous times to be outdoors. Residents are encouraged to favor the crisp air of November and December for vigorous activity. By monitoring wind direction and regional health and dust forecasts, visitors can better navigate the fluctuating quality of the air throughout the year.