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Noya, nestled in the heart of Galicia, Spain, occupies a unique geographic position influencing its air quality. Located at 42.7833°N, -8.8833°W, the city sits within a coastal basin, approximately 5km inland from the Atlantic Ocean and the Ría de Muros e Noya estuary. The terrain is characterised by rolling hills and valleys, typical of the Galician landscape, with an elevation ranging from near sea level to around 200 meters in the surrounding areas. This proximity to the ocean introduces a maritime influence, moderating temperatures and increasing humidity. Noya isn’t situated within a major industrial belt; however, the surrounding region features a mix of agricultural land – primarily small-scale farming and vineyards – and scattered industrial activity related to food processing and fishing. The urban-rural gradient is relatively sharp, with agricultural areas immediately bordering the city limits. This blend of coastal breezes, hilly terrain, and agricultural practices creates complex air circulation patterns. The Ría, while vital for the local economy, can also contribute to localised pollutant concentrations due to limited flushing during calm weather. The prevailing winds, generally from the west, carry maritime air masses, but can also transport pollutants from further inland. Understanding these geographical factors is crucial for interpreting Noya’s air quality dynamics.

Noya’s air quality follows a distinct seasonal pattern, largely dictated by Galician weather systems. Winters (December-February) often see poorer air quality due to temperature inversions trapping pollutants near the ground, coupled with increased wood burning for heating in rural areas surrounding the city. Calm, damp conditions exacerbate this. Spring (March-May) brings improvement as winds increase and rainfall washes away accumulated pollutants, though agricultural activities like fertilizer application can temporarily elevate particulate matter. Summer (June-August) generally offers the cleanest air, benefiting from strong Atlantic breezes and higher temperatures promoting pollutant dispersion. However, prolonged heatwaves can lead to increased ozone formation. Autumn (September-November) is a transitional period, with increasing rainfall initially improving air quality, but a return to stable atmospheric conditions and wood burning as temperatures drop. Sensitive individuals – those with respiratory conditions or the elderly – should be particularly cautious during winter and early spring. Months to favour for outdoor activity are June through September. Fog, common in autumn and winter, can also trap pollutants, reducing visibility and impacting respiratory health. Monitoring wind direction is key, as easterly winds can bring pollutants from more industrialised areas inland.