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Villanueva y Geltrú, a coastal city in Catalonia, Spain, occupies a geographically strategic position on the Mediterranean coastline, approximately 40km southwest of Barcelona. The city’s terrain is relatively flat, transitioning from the beach and coastal plains inland to gently rolling hills. This low elevation, combined with its proximity to the sea, significantly influences its air quality. The Garraf Massif lies to the southwest, providing a partial barrier to inland pollutants, but prevailing winds often carry maritime air masses directly over the city. The surrounding landscape is a mix of urban development, agricultural areas – primarily vineyards and olive groves – and natural parks like the Parc Natural del Garraf. Historically, the port has been central to the city’s economy, and while modernised, port activity contributes to localised emissions. The urban-rural gradient is relatively sharp, with denser development concentrated along the coast and a more dispersed pattern moving inland. This gradient impacts pollutant dispersion, with coastal areas potentially experiencing higher concentrations during certain weather conditions. The city’s location within the Barcelona metropolitan area also means it’s susceptible to regional pollution transport.

Villanueva y Geltrú experiences a Mediterranean climate, with distinct seasonal variations impacting air quality. Summer (June-August) often sees relatively good air quality due to prevailing sea breezes dispersing pollutants, though ozone levels can rise during prolonged periods of intense sunshine and high temperatures. August, with its tourist influx and associated vehicle traffic, can see localised increases in nitrogen dioxide. Autumn (September-November) brings a transition period; decreasing temperatures can lead to temperature inversions, trapping pollutants near the ground, particularly in October and November. Winter (December-February) is generally the period of poorest air quality. Reduced sunlight and stable atmospheric conditions favour pollutant accumulation, and heating systems contribute to particulate matter. January and February are typically the most challenging months. Spring (March-May) sees improving conditions as temperatures rise and winds become more frequent, flushing out accumulated pollutants. However, agricultural activities, such as fertilisation, can contribute to ammonia emissions. Sensitive individuals – children, the elderly, and those with respiratory conditions – should limit strenuous outdoor activity during winter and periods of temperature inversion, and monitor local reports.