Kermanshah Air Quality Index (AQI)

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Kermanshah, the capital of Kermanshah Province in western Iran, occupies a strategic position along the ancient Silk Road corridor connecting Mesopotamia to the Iranian Plateau. Situated at approximately 1,350 meters above sea level in the Zagros Mountains foothills, the city lies within a broad valley flanked by rugged limestone ridges that create a natural topographic basin. This basin effect significantly traps air pollutants, as surrounding mountains inhibit ventilation and dispersion. The city's urban character blends historic Persian architecture with modern industrial expansion, creating a distinct urban-rural gradient where dense central districts transition to agricultural outskirts. Kermanshah's location near Iraq's border places it within an industrial belt that includes oil refineries and manufacturing facilities, whose emissions concentrate in the valley. No major bodies of water moderate the local climate, contributing to dry conditions that exacerbate dust resuspension. The region's semi-arid landscape, with limited vegetation cover, allows construction and road dust to become persistent air quality challenges, particularly when combined with vehicle exhaust from growing transportation networks. This geographic setting makes Kermanshah inherently vulnerable to pollution accumulation, especially during seasonal temperature inversions that cap the valley.

Kermanshah's air quality follows a pronounced seasonal cycle shaped by its cold semi-arid climate. Winter months from November through February experience the worst pollution, as temperature inversions trap vehicle exhaust, industrial emissions, and residential heating pollutants—primarily from fossil fuels—in the valley. Calm winds and frequent fog further reduce dispersion, creating hazardous conditions that sensitive groups like children, elderly, and those with respiratory conditions should avoid prolonged outdoor exposure. Spring brings some relief with increased winds that disperse pollutants, though dust storms from surrounding arid lands can temporarily spike particulate levels, making March and April moderately risky for outdoor activities. Summer sees reduced heating emissions but introduces extreme heat that accelerates photochemical reactions, potentially forming ground-level ozone; however, stronger thermal convection typically improves vertical mixing, making June through August relatively better for outdoor pursuits despite high temperatures. Autumn transitions back to deteriorating conditions as temperatures drop, inversions reestablish, and reduced precipitation allows dust accumulation. For health protection, residents should monitor air quality indices closely during winter inversions, use air purifiers indoors, and schedule outdoor exercise for midday in warmer seasons when mixing is maximized.