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Chełm, nestled in the Lubelskie Voivodeship of eastern Poland, occupies a unique geographical position on the undulating plains of the Lublin Upland. Its coordinates, 51.1322° N, 23.4778° E, place it within a landscape characterized by loess formations – fertile, yet easily eroded soils – and gentle hills. The city’s elevation, averaging around 210 meters above sea level, contributes to localized temperature inversions, a key factor in air quality. Chełm isn’t directly adjacent to major bodies of water, though the Bug River flows nearby, influencing regional humidity. Historically an agricultural hub, the surrounding area remains dominated by farmland, with pockets of light industry concentrated around the city centre and along transport corridors. This blend of agricultural activity and limited industrial presence shapes the city’s pollution profile. The urban-rural gradient is relatively sharp; transitioning quickly from denser residential areas to open fields. This proximity to agricultural land means seasonal burning of crop residue can significantly impact local air quality. The prevailing winds, generally from the west and southwest, can transport pollutants from wider regional sources, while the city’s topography can trap them during calm conditions. Understanding this interplay of terrain, land use, and meteorological patterns is crucial for addressing Chełm’s air quality challenges.

Chełm experiences a continental climate, resulting in distinct seasonal air quality patterns. Winter (December-February) typically sees the poorest air, driven by increased reliance on coal for heating, coupled with frequent temperature inversions that trap pollutants near ground level. Calm, cold conditions exacerbate this, creating stagnant air masses. Spring (March-May) brings a gradual improvement as temperatures rise and heating demand decreases, though agricultural burning begins, introducing particulate matter. Summer (June-August) generally offers the cleanest air, aided by prevailing winds and higher atmospheric mixing. However, heatwaves can trigger photochemical smog formation, increasing ozone levels. Autumn (September-November) is a transitional period. Air quality initially remains good, but deteriorates as heating season approaches and agricultural practices like leaf burning and stubble burning become more common. October and November often see a rapid decline in air quality. Sensitive groups – children, the elderly, and those with respiratory conditions – should limit strenuous outdoor activity during winter and periods of agricultural burning. Monitoring wind direction is also advisable, as pollutants can be transported from neighbouring areas. Fog, common in autumn and winter, can further concentrate pollutants, reducing visibility and exacerbating respiratory issues.