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Mława, situated in the Mazowieckie province of Poland, occupies a relatively flat portion of the North European Plain. Its coordinates, 53.1167° N, 20.3667° E, place it within a landscape dominated by glacial landforms, characterised by moraines and outwash plains. The terrain is gently undulating, influencing local wind patterns and pollutant dispersion. The city is bisected by the River Narew, a major tributary of the Vistula, which provides some natural ventilation but can also contribute to humidity and fog formation, trapping pollutants during temperature inversions. Surrounding Mława is a mix of agricultural land – primarily arable fields – and patches of coniferous forest, typical of the North Masovian Lowland. To the south and east, the landscape transitions towards more extensive forested areas. The urban-rural gradient is fairly sharp, with a noticeable increase in agricultural activity immediately surrounding the city. Historically, Mława developed as a transport hub, lying on important road and rail routes, which has contributed to localised traffic-related emissions. The proximity to larger industrial centres further afield, while not directly within Mława, can contribute to long-range transport of pollutants. The flat topography limits natural dispersion, making the city susceptible to pollutant accumulation, particularly during stable atmospheric conditions.

Mława’s air quality follows a distinct seasonal pattern. Winter, from November to February, typically sees the highest pollution levels. This is largely due to increased reliance on coal and wood burning for heating, combined with frequent temperature inversions – cold, dense air trapped beneath a warmer layer – which prevent vertical mixing and concentrate pollutants near ground level. Fog, common during these months, exacerbates the issue. Spring (March-May) brings a gradual improvement as heating demand decreases and winds become more frequent, dispersing pollutants. However, agricultural activities, such as field preparation and fertilization, can contribute to ammonia emissions. Summer (June-August) generally offers the cleanest air, with higher temperatures promoting pollutant dispersion and reduced heating needs. However, prolonged periods of high pressure and stagnant air can still lead to localised pollution build-up. Autumn (September-October) sees a return to poorer air quality as heating systems are reactivated and agricultural burning may occur. 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; westerly winds can bring pollutants from more industrialised regions. Avoiding peak heating hours in the early morning and evening can also reduce exposure.