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Manjīl, nestled in the verdant Gilan province of northern Iran, occupies a geographically significant position within the Caspian Hyrcanian mixed forests ecoregion. Located at approximately 36.7447° N, 49.4014° E, the city sits at an elevation of roughly 750 meters above sea level, contributing to a cooler climate compared to lower-lying areas. The surrounding landscape is dominated by the Alborz mountain range, which influences local weather patterns and acts as a partial barrier to air mass movement. Manjīl’s proximity to the Caspian Sea, approximately 60 kilometers to the north, introduces a maritime influence, increasing humidity and potentially affecting the dispersion of pollutants. The city’s urban character is relatively small, with a population of around 15,630, suggesting a primarily rural or semi-rural setting. The surrounding region is characterized by a gradual urban–rural gradient, transitioning from agricultural lands – primarily rice paddies and orchards – to denser forest cover further into the mountains. Industrial activity in the immediate vicinity is limited, though larger industrial belts are present further south towards Rasht. The terrain is undulating, with valleys and slopes impacting airflow and potentially leading to localized pollution accumulation, particularly during periods of calm weather. The Hyrcanian forest itself acts as a natural air filter, but its effectiveness is diminished by the city’s presence and potential localized emissions. Topography and prevailing winds play a crucial role in determining air quality, often trapping pollutants in valley bottoms.

Manjīl’s air quality experiences a distinct seasonal cycle heavily influenced by its Caspian climate and mountainous terrain. Winters (December-February) are typically characterized by prolonged periods of fog and temperature inversions, trapping pollutants close to the ground. These inversions, where a layer of warm air sits above cooler air, prevent vertical mixing and significantly worsen air quality. The damp, cool conditions also reduce the dispersion of pollutants. Spring (March-May) brings a gradual improvement as temperatures rise and winds increase, dispersing accumulated winter pollutants. However, agricultural burning, a common practice in the surrounding rural areas to clear fields for planting, can contribute to localized spikes in particulate matter during this period. Summers (June-August) generally see the best air quality, with consistent winds and higher temperatures promoting good ventilation. The Caspian Sea breeze also helps to clear pollutants. Autumn (September-November) marks a transition period, with decreasing temperatures and increasing humidity. As the weather cools, the potential for temperature inversions returns, and agricultural activities may resume, leading to a gradual decline in air quality. Sensitive groups, such as children, the elderly, and individuals with respiratory conditions, should exercise caution during winter months and be mindful of potential agricultural burning in spring. Outdoor activities are generally best enjoyed during the summer months when ventilation is optimal. The combination of topography and seasonal weather patterns creates a complex interplay that dictates Manjīl’s air quality profile.