Thérmi Air Quality Index (AQI)

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Thérmi, nestled within the Kentrikí Makedonía region of Greece, occupies a geographically complex position significantly influencing its air quality. Situated at coordinates 40.5500, 23.0167, the city lies approximately 8km west of Thessaloniki, Greece’s second-largest city, and 20km inland from the Thermaic Gulf. The terrain is characterised by rolling hills and plains, a landscape shaped by ancient geological activity and the Axios River valley. This proximity to Thessaloniki creates a strong urban-rural gradient; while Thérmi retains a more suburban character, it’s heavily influenced by the industrial and transportation emissions emanating from the larger metropolitan area. The surrounding landscape is a mix of agricultural land – primarily cereal crops and vineyards – and forested hills. The Axios River, a major waterway, contributes to local humidity and can influence pollutant dispersion. Elevation varies, but generally remains below 200m, meaning limited atmospheric mixing during stable conditions. The prevailing winds, often from the north or northeast, can funnel pollutants from the industrial zones of Thessaloniki towards Thérmi, exacerbating air quality concerns. The city’s growth, coupled with increasing traffic, further compounds these challenges, creating a localised ‘heat island’ effect that can trap pollutants.

Thérmi’s air quality follows a distinct seasonal pattern. Winter, from December to February, typically sees the poorest air quality. Low temperatures create strong temperature inversions, trapping pollutants near the ground, particularly particulate matter from residential heating using wood and coal. Calm wind conditions further exacerbate this. Spring (March-May) brings gradual improvement as temperatures rise and rainfall increases, washing away accumulated pollutants. However, agricultural burning, common in April and May for field preparation, can cause temporary spikes in particulate matter. Summer (June-August) generally offers the cleanest air, aided by strong southerly winds that disperse pollutants over the Thermaic Gulf and increased atmospheric mixing due to higher temperatures. However, prolonged heatwaves can lead to increased ozone formation. Autumn (September-November) sees a deterioration in air quality as heating systems are reactivated and atmospheric stability returns. November is often a particularly challenging month. Sensitive groups – children, the elderly, and those with respiratory conditions – should limit strenuous outdoor activity during winter and autumn months. Monitoring local forecasts and avoiding peak traffic hours are also advisable. Periods of strong winds in summer are generally favourable for outdoor activities.