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Exmouth, a coastal town in Devon, England (50.6200, -3.4130), occupies a unique geographical position at the mouth of the River Exe, where it meets the English Channel. The town is built on a relatively flat coastal plain, gently rising towards the Woodbury Common and East Devon Area of Outstanding Natural Beauty to the west and north. This landscape, characterised by heathland and agricultural fields, influences local air quality. Exmouth’s proximity to the sea provides a prevailing southwesterly wind, which generally disperses pollutants, but can also bring in marine aerosols and, occasionally, continental air masses. Unlike many industrial cities, Exmouth lacks heavy industry; however, agricultural activity in the surrounding areas contributes to particulate matter, particularly during harvest seasons. The urban-rural gradient is relatively sharp, with farmland immediately bordering the town. The estuary itself acts as a partial barrier to air flow, potentially leading to localised pollutant build-up under certain meteorological conditions. The town’s elevation is low, averaging around 15m, meaning temperature inversions, trapping pollutants near ground level, are a common occurrence, especially during calmer weather. The overall geography promotes good ventilation, but localised factors can create pockets of poorer air quality.

Exmouth’s air quality follows a distinct seasonal pattern. Winter (December-February) often sees poorer air quality due to increased wood burning for heating and stable atmospheric conditions promoting temperature inversions, trapping pollutants. Low wind speeds exacerbate this, particularly in the town centre. Spring (March-May) brings improvement as temperatures rise and winds become more frequent, dispersing pollutants. However, agricultural activities begin, potentially increasing particulate matter from field work. Summer (June-August) generally offers the best air quality, with strong prevailing winds and ample sunshine. However, increased tourist activity and road traffic can lead to localised spikes in nitrogen dioxide. Autumn (September-November) sees a gradual decline in air quality as heating demand increases and atmospheric stability returns. Fog, common during autumn mornings, can trap pollutants, reducing visibility and impacting respiratory health. Sensitive individuals, such as those with asthma or heart conditions, should be particularly cautious during winter and autumn. Avoiding strenuous outdoor activity on still, cold days is advisable. Monitoring local conditions and following health advisories is crucial, especially for vulnerable populations. The peak tourist season can also bring localised congestion and emissions.