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Teano, nestled in the Campania region of Italy, occupies a strategic yet complex geographical position. Situated approximately 40km northeast of Naples and 20km from Caserta, the city is built on gently rolling hills at an elevation of around 220 meters above sea level. This terrain, part of the Volturno River valley, influences air circulation patterns, creating localized pockets where pollutants can accumulate. The surrounding landscape is a mosaic of agricultural land – primarily olive groves, vineyards, and orchards – interspersed with patches of Mediterranean woodland. The Volturno River, a significant waterway, flows nearby, but its influence on direct pollutant dispersion is limited by the hilly topography. While Teano isn’t a major industrial hub itself, its proximity to the more industrialized areas around Caserta and Naples means it can experience pollutant transport. The urban-rural gradient is relatively sharp; the city centre transitions quickly to open countryside. This proximity to agricultural activities introduces potential sources of ammonia and particulate matter from farming practices, impacting local air quality. The prevailing winds, generally from the west, can carry pollutants from the coastal areas inland, affecting Teano’s air quality, particularly during periods of stagnation.

Teano’s air quality follows a distinct seasonal pattern. Spring (March-May) often sees a rise in particulate matter due to agricultural activities – tilling fields and fertilizer application – combined with pollen release. Gentle breezes can exacerbate pollen dispersal, impacting respiratory health. Summers (June-August) typically offer the cleanest air, benefiting from stronger winds that disperse pollutants and infrequent temperature inversions. However, high ozone levels can form during prolonged periods of intense sunshine. Autumn (September-November) brings a deterioration in air quality as heating systems are switched on, increasing emissions of particulate matter and nitrogen oxides. This coincides with calmer weather conditions, trapping pollutants near the ground. November is often the most polluted month. Winters (December-February) are characterized by low temperatures and frequent temperature inversions, which trap cold, dense air beneath a layer of warmer air, preventing vertical mixing and concentrating pollutants. Fog, common in the Volturno valley during winter, further exacerbates this effect. Sensitive individuals – children, the elderly, and those with respiratory conditions – should limit strenuous outdoor activity during autumn and winter months, and monitor local conditions closely.