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Figueira da Foz, nestled within the Coimbra district of Portugal, occupies a unique coastal position where the Mondego River meets the Atlantic Ocean. Its coordinates (40.1508, -8.8618) place it on a relatively low-lying plain, averaging around 10 meters above sea level, gently sloping towards the expansive Praia de Figueira da Foz, one of Portugal’s longest beaches. The city’s urban fabric is characterized by a mix of historic architecture, particularly in the older quarters, and more modern developments concentrated closer to the coastline and along the main thoroughfares. The surrounding landscape is a blend of agricultural land – primarily maize and potatoes – and gently undulating hills, transitioning into the more rugged terrain of the Serra do Arestal to the east. This proximity to agricultural zones introduces potential sources of particulate matter, particularly during harvesting seasons. The Mondego River, flowing from the interior, influences local weather patterns and can, under certain conditions, trap pollutants. Figueira da Foz benefits from a moderate urban–rural gradient; while it’s a significant regional hub, it retains a connection to the surrounding agricultural and natural environments. The prevailing westerly winds, typical of the Atlantic coast, generally provide some degree of natural ventilation, but can also carry pollutants from further inland. The city’s location, while offering stunning coastal views, presents challenges in managing air quality due to its topography and surrounding land use, requiring careful consideration of industrial emissions and agricultural practices.

Figueira da Foz experiences a Mediterranean climate, significantly influencing its air quality throughout the year. Summers (June-August) are typically hot and dry, often accompanied by stable atmospheric conditions. This can lead to temperature inversions, where a layer of warm air traps cooler air near the ground, hindering pollutant dispersion and potentially increasing concentrations of particulate matter and ozone. While coastal breezes offer some relief, prolonged periods of calm weather can exacerbate this effect. Autumn (September-November) brings increased rainfall and a shift in wind patterns, generally improving air quality as pollutants are washed away and dispersed more effectively. Winter (December-February) is the wettest season, with frequent rainfall and stronger winds, further contributing to cleaner air. However, fog, particularly in November and December, can occasionally trap pollutants near the surface, creating localized episodes of reduced visibility and potentially impacting air quality. Spring (March-May) sees a gradual warming and increasing sunshine, with a moderate increase in pollen levels which can affect those with respiratory sensitivities. The agricultural cycle also plays a role; spring planting and summer harvesting can release dust and other particles into the air. Sensitive groups, such as children, the elderly, and individuals with pre-existing respiratory conditions, should be mindful of air quality forecasts, particularly during the summer months, and limit strenuous outdoor activity during periods of stagnant air. Increased vigilance is also advised during foggy winter days.