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Teguise, nestled in the northeastern part of Lanzarote, Canary Islands, Spain (29.0500, -13.5667), presents a unique geographic setting influencing its air quality. The municipality spans a diverse terrain, rising from the coastal plains to the volcanic slopes of the Famara massif. This varied topography creates microclimates and affects pollutant dispersion. Teguise itself is situated inland, approximately 5-8 kilometers from the eastern coastline, benefitting from prevailing trade winds that generally blow from the northeast, carrying maritime air. However, the surrounding landscape is dominated by volcanic badlands and agricultural areas, particularly dedicated to viticulture and potato farming. While not heavily industrialised, agricultural practices contribute to particulate matter through soil disturbance and potential pesticide drift. The urban-rural gradient is relatively sharp; Teguise’s historic centre is a compact, low-rise settlement, contrasting with the more dispersed rural communities and agricultural lands. The elevation increases moving inland towards the mountains, influencing temperature inversions and potentially trapping pollutants during calm conditions. The proximity to the Atlantic Ocean moderates temperatures but also introduces sea salt aerosols, which can act as condensation nuclei for secondary pollutant formation. The island’s volcanic origin means the soil composition is also a factor, potentially releasing minerals into the air during wind erosion.

Teguise experiences a subtropical climate with relatively stable temperatures year-round, but air quality fluctuates seasonally. Winter (December-February) often sees a slight increase in particulate matter due to calmer winds and potential temperature inversions trapping pollutants from local sources, including agricultural activity and domestic heating. February can be particularly dusty due to the Calima, winds bringing Saharan dust. Spring (March-May) brings a gradual improvement as winds pick up and rainfall washes away accumulated pollutants. This is generally a favourable period for outdoor activity. Summer (June-August) is typically the clearest, with consistent trade winds dispersing pollutants effectively. However, high UV radiation can contribute to ground-level ozone formation, particularly on still days. Autumn (September-November) sees a transition period, with decreasing temperatures and potentially more stagnant air. November can experience increased humidity and fog, potentially trapping pollutants. Sensitive groups – those with respiratory conditions, the elderly, and young children – should be particularly cautious during winter and periods of Calima. Monitoring wind direction is crucial; winds from the south or east can bring pollutants from other parts of the island or even mainland Spain. Avoiding strenuous outdoor activity during peak Calima events is advisable.