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Borūjen, nestled within the Chahār Maḩāl va Bakhtīārī province of Iran, occupies a geographically significant position at approximately 31.97°N, 51.29°E. The city’s terrain is characterized by a gently sloping landscape, rising from approximately 1,850 meters (6,070 feet) above sea level, placing it within the Zagros Mountains' foothills. This elevation contributes to a unique microclimate and influences local air circulation patterns. The surrounding landscape is predominantly rural, a mosaic of agricultural lands – primarily wheat and barley cultivation – interspersed with scattered villages and grazing pastures. To the east, the terrain ascends more steeply into the Zagros range, creating a natural barrier that can trap pollutants under certain meteorological conditions. While Borūjen lacks immediate proximity to major rivers or lakes, seasonal streams and springs are present, influencing local humidity and potentially impacting atmospheric moisture content. The urban–rural gradient is relatively sharp; the city transitions quickly into agricultural zones, with limited industrial activity directly adjacent to the urban core. However, regional industrial belts, focused on processing agricultural products and some light manufacturing, are located within a 50-100 kilometer radius, contributing to broader regional air pollution sources. The city’s location within a basin-like topography, combined with the surrounding mountains, can exacerbate air quality challenges by limiting dispersion of pollutants, particularly during periods of atmospheric stability. The prevailing winds, often originating from the northwest, play a crucial role in both transporting and diluting pollutants within the region.

Borūjen’s air quality experiences a distinct seasonal cycle heavily influenced by its climate and topography. Winters, spanning roughly November to March, are typically the most challenging period. Cold temperatures frequently lead to temperature inversions, where a layer of warm air traps cooler air near the ground, preventing vertical mixing and concentrating pollutants. This is compounded by reduced sunlight hours and increased residential heating, primarily reliant on solid fuels, which significantly contributes to particulate matter. Fog, common during these months, further restricts dispersion. Spring (April-May) brings a gradual improvement as temperatures rise, and winds become more frequent, aiding in pollutant dispersal. Agricultural activities, including plowing and fertilizer application, can introduce localized emissions. Summers (June-August) generally offer the best air quality, with higher temperatures promoting atmospheric stability and increased wind speeds. However, dust storms originating from the central Iranian deserts can occasionally impact the city. Autumn (September-October) sees a transitional period, with decreasing temperatures and increasing wind variability. The combination of cooler air and agricultural burning practices can lead to periods of elevated pollution. Sensitive groups, including children, the elderly, and individuals with respiratory conditions, should exercise caution during winter months, limiting outdoor exposure and avoiding strenuous activity. During spring and autumn, monitoring local conditions and being mindful of agricultural activities is advisable. Maintaining indoor air quality through proper ventilation and air filtration can also mitigate potential health impacts throughout the year.