Sepīdān Air Quality Index (AQI)

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Sepīdān, nestled within Fars Province in southwestern Iran, occupies a geographically complex position. Located at coordinates 30.2594° N, 51.9853° E, the city sits amidst the Zagros Mountains foothills, experiencing a varied terrain of rolling hills and valleys. Its elevation, approximately 1700 meters (5577 feet) above sea level, significantly influences its climate and air quality. The surrounding landscape is predominantly rural, characterized by agricultural lands – primarily wheat, barley, and fruit orchards – and sparse vegetation typical of semi-arid regions. Sepīdān isn’t proximate to major bodies of water like the Persian Gulf, but relies on seasonal rainfall and groundwater resources. While not a heavily industrialized hub itself, its regional position within Fars Province means it can be affected by pollutants transported from larger industrial centres further south and east. The urban-rural gradient is quite sharp; Sepīdān remains a relatively small city, with a population of around 14,633, surrounded by agricultural villages and open countryside. This proximity to agricultural activity introduces potential sources of particulate matter from dust and farming practices. The mountainous terrain can also trap pollutants, exacerbating air quality issues during periods of low wind speed and temperature inversions, creating localized pockets of poor air.

Sepīdān’s air quality follows a distinct seasonal pattern. Spring (March-May) brings a temporary improvement as increased rainfall washes away accumulated pollutants, though dust storms originating from western and southern deserts can still impact air quality. Summers (June-August) are typically hot and dry, with high temperatures promoting the formation of ozone, a secondary pollutant. While winds can offer some dispersion, stable atmospheric conditions often prevail, leading to localized pollution build-up. Autumn (September-November) sees a return of dust events as agricultural activities intensify and rainfall remains limited. This is often the period of poorest air quality. Winters (December-February) are cold, with occasional snowfall in the surrounding mountains. Temperature inversions are common, trapping pollutants near the ground and leading to elevated concentrations of particulate matter from residential heating sources – primarily wood and kerosene. Sensitive groups, including children, the elderly, and those with respiratory conditions, should limit outdoor exertion during autumn and winter months. Spring offers the most favourable conditions for outdoor activity, but monitoring dust storm forecasts is crucial. Avoiding peak hours near agricultural areas during harvest seasons can also minimize exposure.