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Anadyr, the administrative centre of Chukotskiy Avtonomnyy Okrug in far eastern Russia, occupies a remarkably challenging geographical position. Situated on a peninsula overlooking Anadyr Bay and the Bering Sea, the city is built on permafrost, significantly influencing its urban development and infrastructure. The terrain is characterised by low hills and valleys, with the Anadyr River flowing through the region, providing a vital freshwater source but also contributing to localised humidity. The surrounding landscape is dominated by tundra vegetation, sparse forests, and rugged coastlines. Unlike many industrial centres, Anadyr lacks extensive heavy industry; however, port activity related to resource extraction (gold, silver, and coal) in the wider Chukotka region contributes to localised emissions. The urban-rural gradient is stark, with the city itself a relatively small settlement surrounded by vast, sparsely populated wilderness. This isolation limits dispersion of pollutants, while the proximity to the ocean introduces marine aerosols into the air. The permafrost thaw, accelerated by climate change, releases methane, a potent greenhouse gas, further impacting the regional atmospheric composition. The city’s elevation, though relatively low, combined with coastal influences, creates unique microclimatic conditions affecting air quality.

Anadyr’s air quality follows a distinct seasonal pattern dictated by the harsh subarctic climate. Winter (November to March) sees the most prolonged periods of poor air quality. Low temperatures create strong temperature inversions, trapping pollutants emitted from heating systems and limited vehicle traffic near the ground. Snow cover reflects sunlight, reducing atmospheric mixing. Spring (April-May) brings a temporary improvement as snow melts and winds increase, but dust and particulate matter from thawing permafrost can become airborne. Summer (June-August) generally offers the cleanest air, with higher temperatures promoting dispersion and rainfall scavenging pollutants. However, increased shipping activity in Anadyr Bay and wildfires in the surrounding tundra can lead to localised spikes in particulate matter. Autumn (September-October) is a transitional period, with decreasing temperatures and increasing heating demand leading to a gradual decline in air quality. Sensitive individuals, including those with respiratory conditions and the elderly, should limit strenuous outdoor activity during winter and autumn. Monitoring wind direction is crucial, as pollutants can accumulate quickly in sheltered areas. Fog, common in coastal areas, can exacerbate respiratory issues. The months of June and July typically present the most favourable conditions for outdoor recreation.