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Takāb, nestled in the western Iranian province of Āz̄arbāyjān-e Gharbī, occupies a geographically complex position within the Zagros Mountains. Situated at coordinates 36.4008° N, 47.1108° E, the city’s elevation contributes significantly to its climate and, consequently, its air quality. The surrounding landscape is characterised by rugged, mountainous terrain, deeply incised valleys, and rolling hills. This topography influences wind patterns, often creating localized pockets of stagnant air where pollutants can accumulate. Takāb isn’t directly adjacent to a major body of water, though the city is within the broader watershed of rivers originating in the Zagros. The urban-rural gradient is relatively sharp; Takāb is a regional centre, but quickly transitions to agricultural lands and sparsely populated mountainous areas. While not a heavily industrialised city, regional agricultural practices, including potential burning of agricultural waste, and limited industrial activity in nearby areas contribute to particulate matter. Dust storms originating from the arid and semi-arid regions to the west and southwest are a recurring feature, impacting air quality. The city’s location within a valley can exacerbate temperature inversions, trapping pollutants near ground level, particularly during colder months. Understanding these geographical factors is crucial for assessing and mitigating air pollution in Takāb.

Takāb experiences a distinct seasonal air quality pattern dictated by its mountainous climate. Spring (March-May) sees improving conditions as snowmelt cleanses the atmosphere, but agricultural burning begins, increasing particulate matter. Summer (June-August) generally offers the cleanest air, with prevailing winds dispersing pollutants and higher temperatures promoting atmospheric mixing. However, prolonged drought conditions can lead to increased dust intrusion from regional sources. Autumn (September-November) marks a transition period; decreasing temperatures and stable atmospheric conditions can lead to temperature inversions, trapping pollutants. This is often the period with the highest concentration of particulate matter. Winter (December-February) is characterised by cold temperatures, frequent temperature inversions, and reduced wind speeds, leading to the poorest air quality. Snowfall can temporarily improve conditions, but also restricts atmospheric dispersion. Sensitive groups – children, the elderly, and those with respiratory conditions – should limit outdoor activity during autumn and winter. Months to favour for outdoor activity are June, July, and August. Fog, common in the colder months, can exacerbate respiratory issues by trapping pollutants at ground level. Monitoring wind direction is crucial, as winds from the west often carry dust and pollutants.