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Romsey, a historic market town in Hampshire, England, occupies a gently undulating landscape within the Test Valley. Situated at coordinates 50.9890, -1.4966, the town is positioned approximately 11 miles northwest of Southampton and 12 miles south of Winchester. The River Test, renowned for its clear chalk stream waters and fly fishing, flows through Romsey, significantly influencing local microclimates and potentially aiding in the dispersion of pollutants. The terrain is largely rural, transitioning from agricultural land – primarily pasture and arable farming – to more densely populated areas within the town itself. This urban-rural gradient is crucial for understanding air quality, as agricultural practices can contribute to particulate matter and ammonia emissions. Romsey isn’t directly within a major industrial belt, but its proximity to the M27 motorway and the Solent region introduces transport-related pollution. The town’s elevation, averaging around 26 metres above sea level, is relatively low, meaning temperature inversions, which trap pollutants, can occur, particularly during calmer weather conditions. The surrounding landscape, characterised by rolling hills and woodland, offers some natural filtration, but prevailing wind patterns, often from the southwest, can carry pollutants from coastal areas and larger urban centres. The town’s compact form and relatively low building heights generally promote better air circulation than larger cities, but localised traffic congestion can create pockets of higher pollution.

Romsey’s air quality follows a distinct seasonal pattern. Winter, from December to February, often sees the poorest air quality due to increased wood burning for heating, combined with colder temperatures leading to temperature inversions that trap pollutants near the ground. Calm, foggy conditions are common, exacerbating the issue. Spring (March-May) brings improvement as temperatures rise and winds become more frequent, dispersing pollutants. However, agricultural activities, such as fertiliser application, can contribute to ammonia levels. Summer (June-August) generally offers the cleanest air, with strong prevailing winds and higher temperatures promoting dispersion. However, occasional heatwaves can lead to increased ozone formation. Autumn (September-November) sees a gradual decline in air quality as heating demand increases and agricultural practices continue. October and November are often marked by damp, still conditions that can trap pollutants. Sensitive individuals – those with respiratory conditions, the elderly, and young children – should be particularly cautious during winter months and periods of stagnant air. Avoiding strenuous outdoor activity during peak pollution times and monitoring local forecasts are recommended. The River Test’s influence, creating localised humidity, can also affect pollutant behaviour, potentially increasing particulate matter concentrations during damp spells.