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Filiaşi, nestled in Dolj County, Romania, occupies a position within the Wallachian Plain, a broad expanse of gently rolling hills and fertile farmland. Located at coordinates 44.4000, 23.5200, the city’s elevation is relatively low, contributing to potential air stagnation. The terrain is predominantly flat, characteristic of the Romanian Plain, with a gradual slope towards the Danube River, approximately 80km to the south. This proximity, while not directly on the riverbank, influences local humidity and can contribute to fog formation, particularly during colder months. Filiaşi is surrounded by intensive agricultural land, primarily cereal crops and sunflower fields, with some livestock farming. While not a major industrial hub itself, the city benefits from, and is potentially impacted by, industrial activity in nearby Craiova, a significant manufacturing centre. The urban-rural gradient is quite sharp; the city centre quickly transitions into open countryside. This proximity to agricultural sources introduces potential for particulate matter from field work and fertilizer application, while the flat topography limits natural dispersion of pollutants. The prevailing winds, generally from the northwest, can carry pollutants from regional sources towards Filiaşi, impacting local air quality. Understanding these geographical factors is crucial for assessing and mitigating pollution risks.

Filiaşi experiences a continental climate, resulting in distinct seasonal air quality patterns. Spring (March-May) sees a gradual improvement after winter, but agricultural activities – ploughing, sowing, and fertilizer spreading – can elevate particulate matter levels, particularly PM10. Summer (June-August) typically offers the cleanest air, aided by higher temperatures and moderate winds promoting dispersion, though occasional heatwaves can trap pollutants. However, ozone formation becomes a concern during prolonged sunny periods. Autumn (September-November) is often marked by a deterioration in air quality. The burning of agricultural waste after harvest is a significant contributor to PM2.5 and PM10, combined with increasing heating demands as temperatures fall. Temperature inversions become more frequent, trapping pollutants near the ground. Winter (December-February) presents the most challenging conditions. Low temperatures encourage the use of solid fuels for heating – wood and coal – leading to high concentrations of PM2.5, black carbon, and sulfur dioxide. Calm, stable weather patterns exacerbate the problem. Sensitive groups – children, the elderly, and those with respiratory conditions – should limit outdoor activity during autumn and winter, particularly on still, cold days. Spring can also pose risks due to agricultural dust. Monitoring local conditions and heeding health advisories is vital.