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Rzhev, nestled within the Tverskaya Oblast’ of Russia, occupies a geographically significant position on the Valdai Hills, a region marking the northwestern edge of the East European Plain. Its coordinates (56.2500, 34.3167) place it approximately 180 kilometers northwest of Moscow, acting as a historical gateway between the capital and regions further north. The city’s terrain is characterized by gently rolling hills and lowlands, sculpted by glacial activity during the Pleistocene epoch. The surrounding landscape is predominantly agricultural, with extensive fields of grain and fodder crops dominating the rural areas. To the west, the Osveya River meanders through the landscape, providing a vital water source and influencing local microclimates. While not directly on a major river, the proximity to the Osveya and numerous smaller streams contributes to localized humidity. Historically, Rzhev’s location has made it vulnerable to weather systems moving in from the Baltic Sea, bringing moisture and influencing precipitation patterns. The urban fabric itself is relatively compact, a legacy of its historical development as a fortified town. The urban–rural gradient is gradual, with agricultural land quickly enveloping the city limits. Industrial activity is limited, primarily focused on food processing and light manufacturing, which, while not major polluters, contribute to localized emissions. The Valdai Hills’ topography can trap cold air during winter months, potentially exacerbating air quality issues, while summer breezes generally provide some degree of ventilation.

Rzhev’s air quality experiences a distinct seasonal cycle heavily influenced by its continental climate. Winter, spanning from November to March, presents the most challenging period. Characterized by prolonged periods of cold temperatures and frequent fog, the city is susceptible to temperature inversions. These inversions trap pollutants near the ground, leading to a build-up of particulate matter and other emissions. The lack of strong winds during this season further compounds the problem, hindering pollutant dispersal. January and February are typically the months with the poorest air quality. Conversely, spring (April-May) brings a noticeable improvement as temperatures rise, and winds increase, effectively flushing out accumulated pollutants. Agricultural activities begin, releasing some biogenic volatile organic compounds (BVOCs), but the overall effect is a reduction in air pollution compared to winter. Summer (June-August) generally offers the best air quality, with warm temperatures, frequent breezes, and occasional rainfall helping to cleanse the atmosphere. However, dry spells can lead to increased dust levels. Autumn (September-October) sees a gradual decline in air quality as temperatures cool, and the agricultural season winds down, releasing dust and emissions from harvest activities. Sensitive groups, including children, the elderly, and individuals with respiratory conditions, should exercise caution during winter months, limiting outdoor exposure and monitoring for any adverse health effects. During periods of fog, even healthy individuals should consider reducing strenuous outdoor activity.