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Oliveira do Hospital, nestled within the Coimbra district of Portugal, occupies a unique geographic position in the Serra da Estrela mountain range foothills. The city’s coordinates (40.3667, -7.8667) place it at an elevation of approximately 610 meters, influencing local weather patterns and air circulation. The surrounding landscape is characterised by rolling hills, forested areas – predominantly pine and eucalyptus – and agricultural land dedicated to vineyards and olive groves. This terrain creates a complex urban-rural gradient; the city itself is relatively compact, but is immediately surrounded by areas of intensive agriculture and forestry. The Mondego River, a significant waterway in Portugal, lies to the south, though its direct influence on local air quality is moderated by the intervening hills. While Oliveira do Hospital isn’t situated within a major industrial belt, regional industrial activity, particularly related to wood processing and agriculture, contributes to background pollution levels. The valley location can trap pollutants during periods of calm weather, exacerbating air quality concerns. The prevailing winds, generally from the west, play a crucial role in dispersing pollutants, but topographic features can disrupt this flow, creating localised pockets of poor air quality. Understanding this interplay between terrain, land use, and meteorological conditions is vital for assessing and mitigating air pollution in Oliveira do Hospital.

Oliveira do Hospital experiences a Mediterranean climate with distinct seasonal variations impacting air quality. Summers (June-August) are typically dry and hot, with increased ozone formation due to strong sunlight and stagnant air. Agricultural activities, including harvesting and pesticide application, can also contribute to particulate matter. Autumn (September-November) brings increased rainfall, which helps to cleanse the atmosphere, but also coincides with the burning of agricultural waste, leading to temporary spikes in PM2.5 and PM10. Winter (December-February) is the wettest season, generally offering the best air quality, though temperature inversions in the valley can trap pollutants, particularly from wood burning for heating. Fog is also common, potentially exacerbating particulate matter concentrations. Spring (March-May) sees a gradual increase in temperatures and agricultural activity, with pollen becoming a significant allergen. Sensitive individuals, such as those with respiratory conditions, should be particularly cautious during spring and summer. Months to avoid strenuous outdoor activity are July and August due to ozone levels, and October/November due to agricultural burning. Individuals with asthma or heart conditions should monitor conditions closely and limit exposure during pollution episodes, regardless of season.