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Āstāneh-ye Ashrafīyeh is nestled within the lush, humid landscapes of Gilan Province, positioned strategically on the fertile plains of Northern Iran. The city's urban character is defined by its intersection with the Sefidrud, one of the region's most significant waterways, which shapes the local topography and sustains the surrounding agricultural heartland. Situated between the towering Alborz Mountains to the south and the expansive Caspian Sea to the north, the city exists in a high-moisture corridor that dictates its climatic behavior. The surrounding landscape is a verdant tapestry of rice paddies and citrus groves, creating a distinct urban–rural gradient where residential clusters blend seamlessly into intensive farming zones. This geographical positioning significantly influences air quality; the proximity to the Caspian Sea facilitates a steady influx of moist maritime air, which generally helps disperse urban pollutants. However, the surrounding dense vegetation and the river valley can create localized microclimates. The low elevation and flat terrain mean that while sea breezes are common, the atmosphere can become stagnant during periods of high humidity. The intersection of agricultural emissions from fertilizer application and the exhaust from regional transport corridors creates a specific pollution profile. Because the Alborz range acts as a massive climatic barrier, it traps moisture and pollutants within the coastal strip, making the city's air quality highly dependent on the interaction between mountain-valley winds and the maritime influence of the nearby sea. Consequently, understanding the local atmospheric dynamics is essential for managing health risks associated with seasonal smog and humidity.

Air quality in Āstāneh-ye Ashrafīyeh follows a distinct seasonal rhythm driven by the Caspian climate. Spring is characterized by high humidity and significant pollen loads from the surrounding Hyrcanian forests, which can exacerbate respiratory distress for allergy sufferers. As the region transitions into summer, intense solar radiation interacts with vehicular emissions to potentially increase ground-level ozone, though the maritime breeze often mitigates the most severe peaks. Autumn presents the most challenging period for air quality; this is when agricultural residues, particularly rice straw, are frequently burned, releasing thick plumes of particulate matter into the lower atmosphere. These emissions, combined with cooling temperatures, can lead to localized smog episodes. Winter brings a different set of challenges as the region experiences frequent, dense fog and temperature inversions. These meteorological conditions trap pollutants close to the ground, preventing vertical dispersion and increasing the concentration of combustion-related particulates from domestic heating. Sensitive groups, including children and the elderly, should limit outdoor exertion during the peak burning months of autumn and the stagnant, foggy mornings of mid-winter. To maintain respiratory health, residents are encouraged to monitor local visibility and avoid high-traffic areas during inversion events. Conversely, late spring and early summer often provide the freshest air, as increased wind speeds and rainfall effectively scrub the atmosphere. By understanding these cycles, residents can better navigate the interplay between the city's agricultural practices and its unique coastal meteorology. Such awareness allows for better planning of outdoor activities while minimizing the risks associated with seasonal atmospheric pollution.