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Rāmsar, nestled in the Māzandarān province of northern Iran, occupies a geographically significant position along the southern coast of the Caspian Sea. Its coordinates (36.9225, 50.6431) place it within a low-lying coastal plain, averaging around 25 meters above sea level, characterized by fertile alluvial soils deposited by the Talar River and its tributaries. The city’s urban fabric is a blend of traditional Iranian architecture and modern development, sprawling outwards from the Caspian shoreline. The surrounding landscape is dominated by the Alborz Mountains to the south, creating a dramatic backdrop and influencing local weather patterns. This proximity to a major body of water, the Caspian Sea, introduces a unique maritime influence, contributing to humidity and potential for coastal fog. Rāmsar’s regional position is crucial; it lies within a corridor connecting major Iranian cities and serves as a vital transportation hub. The urban–rural gradient is relatively swift, transitioning from the city’s built environment to agricultural lands and small villages within a short distance. Significant agricultural zones, particularly rice paddies, surround Rāmsar, and while generally beneficial, agricultural practices can contribute to localized air pollution through the use of fertilizers and occasional burning of crop residue. Further inland, towards the Alborz range, lies a developing industrial belt, primarily focused on food processing and light manufacturing, which represents a potential source of air pollutants. The topography, with the mountains to the south, can also lead to temperature inversions, trapping pollutants close to the ground, especially during calmer periods.

Rāmsar’s air quality experiences a distinct seasonal cycle heavily influenced by its Caspian Sea location and the surrounding topography. Winters (December-February) are typically characterized by prolonged periods of fog and low temperatures, frequently leading to stagnant air conditions and pollutant accumulation. Temperature inversions, where a layer of warm air sits above cooler air near the ground, are common, preventing vertical mixing and trapping emissions. This period often sees the most challenging air quality conditions, with reduced visibility and increased concentrations of particulate matter. Spring (March-May) brings a gradual improvement as temperatures rise and winds increase, dispersing pollutants. However, agricultural activities, including fertilizer application and occasional field burning, can contribute to localized spikes in air pollution. Summers (June-August) are generally the most favorable period, with consistent winds from the Caspian Sea providing effective ventilation and flushing out pollutants. The sea breeze helps to maintain relatively clean air. Autumn (September-November) sees a transition period, with decreasing wind speeds and increasing humidity, which can lead to a gradual decline in air quality as the winter conditions begin to set in. Sensitive groups, such as children, the elderly, and individuals with respiratory conditions, should exercise caution during the winter months, limiting outdoor activity during periods of dense fog or reduced visibility. During spring, awareness of agricultural burning is advised, and avoiding prolonged exposure near fields is recommended. Overall, summer offers the most comfortable conditions for outdoor activities, while autumn and winter require increased vigilance regarding air quality.