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Condeixa-a-Nova, nestled within the Coimbra district of Portugal, occupies a geographically significant position in the Beiras region. Located at approximately 40.1167° latitude and -8.5000° longitude, the municipality sits on a gently sloping terrain, part of the broader Serra do Bussaco mountain range foothills. This location influences local air circulation patterns. The surrounding landscape is predominantly rural, characterized by agricultural fields – primarily vineyards and olive groves – interspersed with pockets of dense woodland, contributing to a generally clean air baseline. The city itself exhibits a traditional Portuguese urban character, with a compact historical center and a gradual expansion outwards, reflecting a moderate urban–rural gradient. While not directly adjacent to a major river, Condeixa-a-Nova benefits from proximity to the Mondego River, approximately 15 kilometers to the east, which can influence humidity and local weather systems. The elevation, averaging around 350 meters above sea level, contributes to temperature inversions during colder months, potentially trapping pollutants closer to the ground. There are no major industrial belts immediately bordering Condeixa-a-Nova; however, Coimbra, a larger urban center with some industrial activity, lies within a reasonable commuting distance, and its emissions can occasionally impact air quality. The prevailing winds generally flow from the west, carrying air masses across the Atlantic, which typically helps to dilute pollutants, but local topography can disrupt this flow, creating pockets of stagnant air. The region's climate, characterized by hot, dry summers and mild, wet winters, further shapes the city's air quality profile.

Condeixa-a-Nova’s air quality experiences a distinct seasonal cycle driven by meteorological factors. Summers (June-August) are typically characterized by high temperatures and prolonged periods of sunshine, often accompanied by light winds. This can lead to a build-up of photochemical smog, particularly during stagnant weather conditions. The intense solar radiation promotes the formation of ozone, a secondary pollutant, and can exacerbate the effects of any existing particulate matter. Spring (March-May) and Autumn (September-November) generally offer the most favourable air quality, with moderate temperatures and more frequent wind events that disperse pollutants. However, autumn can occasionally see episodes of elevated particulate matter due to agricultural burning practices in the surrounding rural areas. Winters (December-February) present a different challenge. The cooler temperatures and increased humidity often lead to the formation of fog, particularly in the mornings, which traps pollutants near the ground. Temperature inversions are also more common during this period, further hindering vertical mixing and concentrating emissions. Sensitive groups, such as children, the elderly, and individuals with respiratory conditions, should exercise caution during these periods, limiting prolonged outdoor activity, especially during foggy mornings or days with stagnant air. While the city’s rural setting generally mitigates severe pollution events, awareness of these seasonal patterns and associated weather conditions is crucial for protecting public health. The drier conditions of summer, coupled with the potential for agricultural burning in autumn, require particular vigilance.