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Sarqan, nestled within the Zhetisū Region of Kazakhstan, occupies a geographically significant position at approximately 45.41° N, 79.91° E. The city’s terrain is characterized by gently rolling hills and plains, typical of the broader Kazakh Steppe landscape. Situated at an elevation of roughly 650 meters above sea level, Sarqan benefits from a relatively moderate climate, though its location is crucial in understanding its air quality challenges. The surrounding landscape is dominated by expansive grasslands and agricultural fields, forming a gradual urban-rural gradient. To the south, the foothills of the Tian Shan mountains begin to rise, influencing regional weather patterns and potentially trapping pollutants under certain conditions. Sarqan’s proximity to agricultural zones means seasonal agricultural burning can contribute to particulate matter in the air, particularly during harvest periods. While not directly adjacent to a major river, the nearby Syr Darya River, though facing water scarcity issues, influences regional humidity and wind patterns. The city’s regional position places it within a zone experiencing increasing industrial activity, with several mining operations and processing plants located within a 100-kilometer radius. This industrial belt, combined with agricultural practices and the steppe’s inherent susceptibility to dust storms, creates a complex interplay of factors impacting Sarqan’s air quality. The city’s relatively small size (population 14,305) means localized emissions from residential heating and limited transportation contribute to the overall pollution profile.

Sarqan’s air quality experiences a distinct seasonal cycle heavily influenced by meteorological conditions. Winters (December-February) 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 pollutants from dispersing. Residential heating, reliant on coal and other solid fuels, significantly increases particulate matter emissions during these months. Fog, common in winter, further exacerbates the problem by trapping pollutants close to the ground. Spring (March-May) brings a gradual improvement as temperatures rise and inversions become less frequent, although dust storms originating from the surrounding steppe can still impact air quality. Agricultural burning, associated with the spring planting season, also contributes to elevated particulate levels. Summer (June-August) generally offers the best air quality, with warmer temperatures promoting atmospheric mixing and dispersing pollutants. However, occasional heatwaves can lead to stagnant air conditions. Autumn (September-November) sees a return to more variable conditions. Harvest season brings increased agricultural burning, and the onset of cooler temperatures can trigger localized inversions. Wind patterns play a crucial role; prevailing winds from the Tian Shan mountains can sometimes bring cleaner air, while calm conditions allow pollutants to accumulate. Sensitive groups, including children, the elderly, and individuals with respiratory conditions, should exercise caution during winter months and be mindful of agricultural burning periods in spring and autumn. Outdoor activities are generally best enjoyed during the summer months, avoiding periods of stagnant air or dust storms.