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Siemiatycze, nestled in the Podlaskie Voivodeship of eastern Poland, occupies a gently undulating landscape within the broader East European Plain. The city’s coordinates (52.4272, 22.8625) place it roughly equidistant between Warsaw and Białystok, acting as a regional hub for a largely agricultural area. The terrain is characterised by low hills and broad valleys, sculpted by glacial activity during the last ice age. The Bug River flows nearby, influencing local humidity and occasionally contributing to temperature inversions, particularly during calmer weather. Siemiatycze isn’t situated within a major industrial belt; its surrounding areas are dominated by farmland – primarily cereal crops and livestock farming – which, while generally less polluting than heavy industry, can contribute to particulate matter from agricultural practices like field preparation and manure spreading. The urban-rural gradient is quite sharp, with the city centre giving way rapidly to open countryside. This proximity to rural areas means that long-range transport of pollutants from distant sources can also impact air quality. The relatively flat terrain and lack of significant natural barriers can allow pollutants to accumulate, especially during stable atmospheric conditions. Understanding this geographical context is crucial for interpreting local air quality patterns.

Siemiatycze experiences a continental climate, resulting in distinct seasonal air quality variations. Winter (December-February) often sees the poorest air quality, driven by increased reliance on solid fuel heating – coal and wood – for residential purposes. Temperature inversions are common during these months, trapping pollutants near ground level. Spring (March-May) brings a gradual improvement as heating demand decreases, but agricultural activities begin, potentially raising particulate matter levels. Summer (June-August) generally offers the cleanest air, with prevailing winds dispersing pollutants and higher temperatures promoting atmospheric mixing. However, heatwaves can exacerbate ozone formation. Autumn (September-November) is a transitional period. Air quality initially remains good, but deteriorates as heating season approaches and agricultural burning occurs after harvest. October and November are often marked by stagnant air masses and increased pollution. Sensitive groups – children, the elderly, and those with respiratory conditions – should limit strenuous outdoor activity during winter and periods of agricultural burning. Fog, frequent in autumn and winter, can further concentrate pollutants. Monitoring wind direction is key; winds from the south or east may carry pollutants from industrial areas further afield. Avoiding outdoor exercise during calm, cold mornings is advisable.