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Gyomaendrőd, nestled in the southern Great Hungarian Plain (Alföld) within the Békés county, occupies a geographically significant position. Its coordinates (46.9361, 20.8233) place it amidst a predominantly flat landscape, characteristic of the Pannonian Basin. The terrain is gently undulating, primarily composed of fertile loess soils ideal for agriculture, which dominates the surrounding area. The city sits approximately 138 meters above sea level, contributing to a relatively stable atmospheric profile, though susceptible to temperature inversions during colder months. The Körös River, a vital waterway, flows nearby, influencing local microclimates and providing a potential pathway for pollutant dispersal, though its impact is generally moderated by the expansive plains. Gyomaendrőd’s location is far removed from major industrial belts; the regional economy is largely agrarian, with significant agricultural activity including crop cultivation (wheat, corn, sunflowers) and livestock farming. This rural dominance means that agricultural practices, such as fertilizer application and livestock emissions, can contribute to localized air quality concerns. The urban–rural gradient is gradual, with smaller villages and agricultural fields seamlessly blending into the city’s periphery. The lack of significant topographic barriers allows for relatively unimpeded wind flow, which can both dilute pollutants and transport them over considerable distances. The surrounding landscape, a vast expanse of farmland punctuated by occasional woodlands, shapes the city’s air quality profile, making it sensitive to regional agricultural emissions and weather patterns.

Gyomaendrőd’s air quality experiences a distinct seasonal cycle dictated by Hungary’s continental climate. Spring (March-May) often brings a noticeable increase in particulate matter due to agricultural activities – plowing, fertilizer spreading, and the initial stages of crop growth release dust and ammonia into the atmosphere. Wind patterns during this period can be variable, sometimes trapping pollutants locally. Summer (June-August) generally sees improved air quality due to higher temperatures, increased convective mixing, and more frequent rainfall, which naturally cleanses the air. However, hot, still days can lead to localized ozone formation. Autumn (September-November) presents a mixed picture. Harvest season intensifies agricultural emissions, while cooler temperatures can occasionally trigger temperature inversions, particularly in the mornings, trapping pollutants near the ground. Winter (December-February) is typically the most challenging period. Cold, stable air masses, coupled with frequent fog and temperature inversions, significantly reduce vertical mixing, leading to a build-up of pollutants, especially particulate matter from residential heating (often wood or coal-burning). Sensitive groups, including children, the elderly, and individuals with respiratory conditions, should limit prolonged outdoor exposure during these periods, particularly on days with dense fog or calm winds. Outdoor activities are generally most favorable during the summer months, although vigilance regarding ozone levels on hot days is advised. Spring and autumn require careful monitoring of local conditions and awareness of agricultural practices’ impact.