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Chaltyr, a small city nestled in Rostovskaya Oblast’ of Russia, occupies a position within the Donets Ridge, a gently undulating upland region. Its coordinates (47.2848, 39.4823) place it in the southwestern part of the region, approximately 50km northeast of Rostov-on-Don. The terrain is characterised by ravines and small river valleys, typical of the erosion-prone Donets Ridge. The city itself is situated on the banks of the Tuzlov River, a tributary of the Don River, which provides a local hydrological influence. Surrounding Chaltyr is a landscape dominated by agricultural land, primarily wheat and sunflower cultivation, interspersed with patches of steppe vegetation. While not a major industrial hub, the proximity to larger industrial centres like Rostov-on-Don and the presence of smaller agricultural processing facilities contribute to potential localised pollution sources. The urban-rural gradient is relatively sharp, with agricultural fields immediately bordering the city limits. This proximity means that prevailing winds can readily transport agricultural dust and pollutants into the city, impacting air quality. The relatively flat terrain offers limited natural dispersion of pollutants, potentially exacerbating localised air quality issues, particularly during periods of calm weather. The city’s elevation, around 80-100m above sea level, doesn’t significantly influence regional air flow patterns but can contribute to temperature inversions.

Chaltyr experiences a continental climate, resulting in distinct seasonal air quality patterns. Spring (March-May) sees a rise in particulate matter due to agricultural activities – ploughing and sowing release dust and soil particles. Melting snow also exposes accumulated winter pollutants. Summer (June-August) generally offers the best air quality, with prevailing winds aiding dispersion and rainfall scavenging pollutants. However, heatwaves can lead to increased ozone formation, particularly near agricultural areas with pesticide use. Autumn (September-November) brings a deterioration in air quality as heating systems are activated, increasing emissions from coal and wood burning, common in the region. Fog is also frequent during this period, trapping pollutants near the ground. November is often the most polluted month. Winter (December-February) is characterised by stable, cold air masses and frequent temperature inversions, which trap pollutants close to the surface. Snow cover reflects pollutants, increasing their concentration. Sensitive groups – children, the elderly, and those with respiratory conditions – should limit outdoor activity during autumn and winter. Spring can also pose risks due to pollen and dust. Monitoring wind direction and avoiding activity near agricultural fields during ploughing are advisable. Periods of calm weather in any season warrant increased caution.