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Situated in the southwestern expanse of the Hamadān province, Malāyer occupies a pivotal position within the rugged Zagros mountain range of western Iran. At an elevation of approximately 1,700 meters above sea level, the city is cradled by a complex topography of rolling hills and high-altitude plateaus. This elevated, landlocked setting profoundly dictates the local microclimate and atmospheric stability. The surrounding landscape is characterized by expansive agricultural zones, particularly famous for viticulture, which define the regional economy and land use. The urban character of Malāyer is that of a dense, growing hub surrounded by semi-arid terrain that transitions into higher mountain peaks to the west and south. This unique geographical bowl effect creates a significant challenge for air quality. Because the city is nestled in a valley-like depression within the Zagros foothills, it is susceptible to stagnant air masses. During periods of low wind, pollutants from local vehicular traffic, small-scale industrial workshops, and the burning of agricultural residues become trapped by the surrounding elevations. Furthermore, the city’s proximity to arid, desert-like regions means that it is often subjected to dust storms originating from the Iraqi plains and internal Iranian plateaus. The urban-rural gradient is stark; while the city core experiences high concentrations of combustion-related particulates, the immediate outskirts are subject to seasonal agricultural dust. As urban expansion continues, the interaction between the city’s topographic confinement and the prevailing westerly winds remains the primary driver of its atmospheric health, necessitating careful monitoring of both industrial emissions and regional wind-borne dust patterns.

Malāyer experiences a distinct continental climate, where seasonal shifts dictate the rhythm of air quality cycles. During the spring, the city enjoys relatively cleaner air as seasonal rains wash away particulates, though occasional spring dust storms can temporarily spike PM10 levels. Summer brings hot, dry conditions where the lack of precipitation and increased solar radiation facilitate the formation of ground-level ozone. This is a period when the atmosphere is often stable, leading to the accumulation of pollutants during the day. Autumn serves as a transitional period, characterized by cooling temperatures and the onset of stable atmospheric conditions. It is during the late autumn and throughout the winter that Malāyer faces its most significant air quality challenges. The phenomenon of temperature inversion becomes a frequent occurrence, where cold, dense air is trapped near the surface by a layer of warmer air aloft, preventing the vertical dispersion of pollutants. During these months, domestic heating emissions and traffic exhaust linger at ground level, creating a thick, persistent haze over the urban center. Sensitive groups, including children, the elderly, and those with respiratory conditions, should favor early mornings or late evenings for outdoor exercise during the spring, while avoiding prolonged outdoor exertion in mid-winter during stagnant, windless days. The winter months, particularly December and January, are the times when residents should prioritize indoor air quality and remain vigilant regarding local air alerts. By understanding these meteorological patterns, inhabitants can better navigate the seasonal variations of the Zagros mountain atmosphere.