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Międzyrzec Podlaski, nestled within the Lubelskie Voivodeship of eastern Poland, occupies a geographically significant position at the crossroads of historical trade routes and within a landscape shaped by the Podlasie Lowland. Its coordinates (51.9833, 22.7833) place it amidst gently rolling terrain, characterized by fertile agricultural lands and interspersed with pockets of mixed deciduous and coniferous forests. The city sits at an elevation of approximately 170 meters above sea level, contributing to a relatively stable atmospheric profile, though susceptible to localized inversions. The surrounding landscape is predominantly rural, dominated by agricultural fields – primarily grain and rapeseed cultivation – and smaller-scale livestock farming. This proximity to intensive agriculture introduces potential sources of ammonia and particulate matter, particularly during planting and harvesting seasons. To the east, the vast expanse of the Bug River forms a natural boundary, influencing local weather patterns and providing a degree of moisture that can sometimes help to cleanse the air. The urban–rural gradient is gradual, with smaller villages and agricultural holdings extending outwards from the city limits. While Międzyrzec Podlaski isn't situated directly within a major industrial belt, its location within a region experiencing increasing agricultural intensification and occasional transport-related emissions means air quality is influenced by both regional and local factors. The relatively flat topography can also exacerbate the accumulation of pollutants, particularly during periods of stagnant air.

Międzyrzec Podlaski’s air quality experiences a distinct seasonal cycle heavily influenced by meteorological conditions and agricultural practices. Spring (March-May) often sees elevated levels of particulate matter due to agricultural activities like fertilizer application and field preparation, combined with increased pollen counts. The warming temperatures can also lead to increased volatile organic compound (VOC) emissions from vegetation. Summer (June-August) generally offers the best air quality, with frequent rainfall and convective mixing dispersing pollutants. However, periods of prolonged heat and stagnant air can still lead to localized ozone formation. Autumn (September-November) brings a resurgence of particulate matter as harvest activities intensify and leaf litter decomposition releases organic compounds. Temperature inversions, common during clear, calm nights, can trap pollutants close to the ground, particularly in the early morning hours. Winter (December-February) presents the most challenging period. Cold temperatures and frequent temperature inversions lead to pollutant accumulation, exacerbated by potential emissions from residential heating (often utilizing solid fuels like coal and wood). Fog, a common occurrence during winter, further traps pollutants, reducing visibility and increasing exposure. Sensitive groups, including children, the elderly, and individuals with respiratory conditions, should limit outdoor activity during periods of stagnant air and fog, particularly in the early morning. During the agricultural seasons, minimizing exposure during peak activity times is advisable. Maintaining indoor air quality through ventilation and air purification can also offer protection.