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Novomoskovsk, situated in the Tul’skaya Oblast’ of Russia at coordinates 54.0833°N, 38.2167°E, occupies a strategic position within the Central Federal District. The city is located on the Nara River, a tributary of the Oka River, and benefits from relatively flat terrain characteristic of the Oka-Don Plain. This landscape, historically shaped by glacial activity, contributes to limited natural dispersion of pollutants. Novomoskovsk’s urban character is defined by its industrial heritage, particularly its significant chemical and metalworking industries, legacies of Soviet-era planning. The surrounding region is a mix of agricultural land – primarily arable fields – and pockets of birch and mixed forests. This proximity to agricultural zones introduces seasonal particulate matter from harvesting and fertilizer application. The urban-rural gradient is relatively sharp, with the city acting as a concentrated industrial and population centre amidst a predominantly rural backdrop. The Nara River, while providing a water resource, can also act as a conduit for pollutant transport, particularly during periods of low flow. The city’s location, downwind of larger industrial centres to the northwest, can also contribute to background pollution levels, impacting local air quality. The elevation is relatively low, around 170 meters above sea level, further limiting atmospheric mixing.

Novomoskovsk experiences a continental climate, resulting in distinct seasonal air quality patterns. Winter (November to March) sees pollution levels often peak due to temperature inversions – cold, dense air trapped beneath warmer layers – hindering vertical dispersion of emissions from heating systems and industrial activity. Reduced sunlight also limits photochemical reactions that can break down pollutants. February and March are typically the most challenging months. Spring (April-May) brings a temporary improvement as warmer temperatures and increased precipitation help to wash pollutants from the air, though agricultural burning can introduce localised spikes in particulate matter. Summer (June-August) generally offers the best air quality, with prevailing winds aiding dispersion and higher temperatures promoting pollutant breakdown. However, stagnant high-pressure systems can still lead to localised pollution build-up. Autumn (September-October) sees a gradual deterioration as heating demand increases and atmospheric stability returns. Sensitive individuals – children, the elderly, and those with respiratory conditions – should limit strenuous outdoor activity during winter and autumn months. Monitoring wind direction is crucial; winds from the northwest may carry pollutants from regional industrial sources. Fog, common in autumn and winter, exacerbates particulate matter concentrations.