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Hamadānak, nestled within the Tehran province of Iran at coordinates 35.5422° N, 51.1383° E, occupies a significant position in the central Alborz mountain range. This city of approximately 11,216 inhabitants is situated at an elevation of roughly 1,700 meters (5,577 feet), contributing to a cooler climate and influencing air dispersion patterns. The surrounding landscape is characterised by rugged mountains and valleys, typical of the Iranian plateau. Unlike coastal cities, Hamadānak lacks proximity to large bodies of water, meaning it doesn’t benefit from marine influences that can sometimes help clear pollutants. The urban-rural gradient is relatively sharp; the city itself is compact, quickly transitioning to agricultural lands and mountainous terrain. While not a major industrial hub like Tehran, the region supports smaller-scale workshops and agricultural activities, contributing to localised emissions. The terrain funnels winds through the valleys, which can exacerbate pollution build-up during stable atmospheric conditions. The city’s location within a basin-like structure, common in the Alborz range, limits air circulation, trapping pollutants and increasing their concentration, particularly during temperature inversions. This geographical setting is a primary driver of Hamadānak’s air quality challenges.

Hamadānak experiences a distinct seasonal air quality pattern dictated by meteorological conditions. Spring (March-May) often sees moderate pollution levels as snowmelt increases moisture and can temporarily suppress dust, but agricultural burning begins, releasing particulate matter. Summers (June-August) are generally drier with higher temperatures, leading to increased ozone formation, particularly on sunny days. However, stronger winds can provide some dispersion. Autumn (September-November) is often the most challenging period. Temperature inversions become frequent as the air cools, trapping pollutants from heating systems and vehicle emissions near the ground. Reduced rainfall further concentrates these pollutants. Winter (December-February) brings cold temperatures and increased reliance on fossil fuels for heating, resulting in elevated levels of particulate matter and sulfur dioxide. Fog is also common, exacerbating visibility and trapping pollutants. Sensitive groups – children, the elderly, and those with respiratory conditions – should limit outdoor activity during autumn and winter. Spring and summer offer better conditions, but monitoring local reports is still advisable. Avoiding peak traffic hours and staying indoors during inversion events are crucial preventative measures.