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Borşa, nestled within the Maramureș region of Romania, occupies a dramatic and geographically defining position in the Rodna Mountains. Located at approximately 47.6553° N, 24.6631° E, the town sits at a significant elevation of around 850 meters (2,789 feet) above sea level, contributing to its cool climate and unique atmospheric conditions. The surrounding landscape is dominated by steep, forested slopes, characteristic of the Carpathian range, with the Bistrița River carving a valley through which Borșa extends. This valley configuration significantly influences local air circulation; the mountains act as barriers, potentially trapping pollutants under certain meteorological conditions. The urban character of Borșa is distinctly rural, with a relatively low population density and a strong agricultural presence in the surrounding areas. While not directly adjacent to major industrial belts, the region supports livestock farming and forestry, activities that can contribute to localized air emissions, particularly during harvest seasons or periods of intense agricultural activity. The urban–rural gradient is gradual, with small villages and agricultural fields seamlessly blending into the mountainous terrain. The proximity to the Bistrița River, while providing a water source, can also contribute to localized humidity and fog formation, impacting pollutant dispersion. The town's location within a deep valley, combined with the mountainous topography, creates a microclimate susceptible to temperature inversions, a key factor in air quality dynamics.

Borșa’s air quality experiences a distinct seasonal cycle heavily influenced by its mountainous geography and climate. Winter months (December-February) often see the poorest air quality, primarily due to temperature inversions. Cold air settles in the valley, trapping warmer air aloft, preventing vertical mixing and concentrating pollutants released from residential heating (primarily wood-burning stoves, a common practice in the region) and agricultural activities. Fog, frequently occurring during these months, further exacerbates the issue by limiting pollutant dispersion. Spring (March-May) brings a gradual improvement as temperatures rise, and wind speeds increase, aiding in the dispersal of pollutants. However, agricultural burning, a traditional practice for land clearing, can lead to short-term spikes in particulate matter. Summer (June-August) generally offers the best air quality, with consistent winds and higher temperatures promoting good ventilation. However, occasional heatwaves can lead to stagnant air conditions. Autumn (September-November) presents a transitional period. As temperatures cool, the risk of temperature inversions returns, and agricultural activities, including harvest and preparation for winter, can contribute to localized emissions. Sensitive groups, such as children, the elderly, and individuals with respiratory conditions, should exercise caution during winter and early spring, limiting outdoor exposure on days with persistent fog or calm conditions. During harvest season, even healthy individuals should consider minimizing strenuous outdoor activity.