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Petrovac na Mlavi, nestled in central Serbia, occupies a geographically significant position within the Mlava River valley. The city’s location, at approximately 44.3783° N, 21.4194° E, dictates a gently undulating terrain, characteristic of the Pannonian Basin. Elevation averages around 130 meters above sea level, contributing to a relatively stable atmospheric layer, though susceptible to temperature inversions under specific weather conditions. The Mlava River, after which the city is named, meanders through the municipality, influencing local humidity and potentially trapping pollutants under stagnant air conditions. Petrovac na Mlavi sits on the edge of a predominantly agricultural zone, with extensive fields of wheat, corn, and sunflower dominating the surrounding landscape. This agricultural activity, while vital to the regional economy, can contribute to particulate matter pollution, particularly during planting and harvesting seasons due to soil erosion and machinery emissions. The urban–rural gradient is gradual; the city itself is a modest size, with residential areas blending seamlessly into the agricultural periphery. While not directly adjacent to major industrial belts, Petrovac na Mlavi benefits from proximity to larger regional centers like Zaječar and Niš, which can occasionally influence air quality through transported pollutants. The surrounding landscape, a mix of fertile plains and low hills, generally promotes good ventilation, but localized topography can create pockets of poor air circulation, especially during periods of calm weather. The climate is continental, with hot summers and cold winters, further impacting atmospheric stability and pollutant dispersion.

Petrovac na Mlavi’s air quality experiences a distinct seasonal cycle heavily influenced by its continental climate. Spring (March-May) often brings a noticeable increase in particulate matter, linked to agricultural activities – plowing, fertilizer application, and the initial stages of planting. Dust from these operations, combined with occasional temperature inversions that trap pollutants near the ground, can lead to reduced visibility and respiratory irritation. Summer (June-August) typically sees improved air quality due to higher temperatures and increased convective mixing, which disperses pollutants more effectively. However, prolonged heatwaves can exacerbate ozone formation, a secondary pollutant. Autumn (September-November) presents a mixed picture. While wind patterns generally improve ventilation, agricultural harvesting generates significant dust, and the cooler temperatures can lead to the re-emergence of temperature inversions. Winter (December-February) is often the most challenging period. Cold, stable air masses frequently result in temperature inversions, trapping pollutants close to the ground. Fog, common during winter mornings, further restricts dispersion. The lack of wind during these periods intensifies the problem. Sensitive groups, including children, the elderly, and individuals with respiratory conditions, should limit outdoor exertion during periods of stagnant air, particularly in the mornings. During the spring and autumn, wearing a mask during peak agricultural activity can offer some protection. Staying informed about local weather forecasts and air quality reports is crucial for making informed decisions about outdoor activities throughout the year.