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Tarbes, nestled in the foothills of the Pyrenees mountains within the Occitanie region of southwestern France, presents a unique geographic context influencing its air quality. Situated at an elevation of approximately 420 meters (1378 feet), the city occupies a relatively flat basin, a former glacial lakebed, bordered by rising terrain to the south and west. This basin topography can contribute to the trapping of pollutants, particularly during periods of atmospheric stability. The Adour river flows nearby, offering some natural ventilation, but its influence is limited by the surrounding hills. Tarbes is a regional centre, serving a largely agricultural hinterland – the plains of the Adour and the surrounding valleys are dominated by livestock farming and cereal production. While not heavily industrialised itself, the city benefits from, and is affected by, transport links to larger industrial areas further afield. The urban-rural gradient is relatively sharp; moving south quickly leads into mountainous terrain, while the plains to the north are intensely farmed. This proximity to agricultural activity introduces potential sources of ammonia and particulate matter from fertilizer use and livestock. The prevailing winds, generally from the west, can carry pollutants from the Atlantic coast, while easterly winds can bring in continental air masses. The city’s compact urban form, typical of many French towns, concentrates emissions from domestic heating and traffic.

Tarbes experiences a distinct seasonal air quality pattern. Winter, from December to February, often sees the poorest air quality. Low temperatures encourage increased use of wood-burning stoves for heating, a significant source of particulate matter (PM2.5 and PM10). Coupled with frequent temperature inversions – warm air trapping cooler, polluted air near the ground – these conditions lead to pollutant accumulation in the basin. Spring (March-May) brings improvement as temperatures rise and heating demand decreases, though agricultural activities begin to contribute to ammonia levels. Summer (June-August) generally offers the cleanest air, with prevailing winds dispersing pollutants and higher temperatures promoting atmospheric mixing. However, heatwaves can exacerbate ozone formation, a secondary pollutant. Autumn (September-November) sees a transition, with increasing heating demand and potential for stagnant air masses. October and November can be particularly problematic. Sensitive individuals – children, the elderly, and those with respiratory conditions – should limit strenuous outdoor activity during winter and periods of stagnant weather. Monitoring pollen levels is also crucial in spring and summer. Fog, common in the autumn and winter, can further concentrate pollutants near the ground, reducing visibility and impacting respiratory health. Avoiding peak traffic hours is advisable year-round.