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Pruszków, situated in the Mazowieckie province of Poland, occupies a central position within the Warsaw metropolitan area, approximately 20 kilometers southwest of the capital. The city’s geography is characterized by relatively flat, gently undulating terrain, part of the North European Plain. This low-lying landscape, averaging around 100 meters above sea level, facilitates the accumulation of air pollutants, particularly during stable atmospheric conditions. Historically an agricultural area, Pruszków has undergone significant industrialization, particularly during the socialist era, leaving a legacy of industrial zones that contribute to localized pollution sources. The Bzura River flows nearby, but its influence on immediate air quality is limited due to prevailing wind patterns. The surrounding landscape is a mosaic of farmland, forests (particularly to the west), and increasingly, suburban development, creating a pronounced urban-rural gradient. This gradient impacts air quality as pollutants generated in Pruszków can disperse into the surrounding rural areas, while conversely, agricultural activities (fertilizer use, burning of agricultural waste) can contribute to background pollution levels. The proximity to Warsaw’s major transport corridors – highways and rail lines – also introduces significant transboundary pollution. The city’s position within a regional transport hub exacerbates these effects, making Pruszków a focal point for pollutant concentration.

Pruszków’s air quality follows a distinct seasonal pattern. Winter, from November to February, typically sees the poorest air quality. Low temperatures encourage the widespread burning of solid fuels – coal and wood – for residential heating, a significant source of particulate matter (PM2.5 and PM10). Frequent temperature inversions trap pollutants near the ground, exacerbating the problem. Spring (March-May) brings a gradual improvement as heating demand decreases, but agricultural activities, like field preparation and fertilizer application, can introduce ammonia and dust. Summer (June-August) generally offers the cleanest air, aided by higher temperatures, increased wind speeds, and rainfall which helps to wash pollutants from the atmosphere. However, heatwaves can lead to increased ground-level ozone formation. Autumn (September-October) sees a return to poorer conditions as heating season begins again, combined with stagnant air masses. 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 east or southeast often carry pollutants from Warsaw and industrial areas. Avoiding peak hours near major roads is also advisable. Periods of heavy rainfall offer temporary relief, making those days more favourable for outdoor pursuits.