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Marlow, nestled in the picturesque Chiltern Hills of Buckinghamshire, occupies a unique geographic position that significantly influences its air quality. Situated on the banks of the River Thames, the town’s topography is characterized by gently sloping hills and valleys, a typical feature of the Chilterns’ clay-rich landscape. The surrounding area is predominantly rural, a patchwork of farmland, woodland, and traditional villages, creating a gradual urban–rural gradient. Marlow itself is a relatively compact settlement, retaining a charming market town character with a mix of historic buildings and modern developments. Its location approximately 30 miles west of London places it within the broader Southeast England region, susceptible to influences from the London urban area and its associated industrial and transportation activity. The Thames corridor acts as a natural ventilation pathway, but can also trap pollutants under certain meteorological conditions. The elevation varies within the town, with higher points offering better dispersion of pollutants, while lower-lying areas closer to the river are more prone to stagnation. While not directly adjacent to major industrial belts, the proximity to the M40 motorway, a vital transport artery, introduces a source of road traffic emissions. Agricultural practices in the surrounding farmland, including fertilizer use and livestock farming, can contribute to ammonia emissions, impacting local air quality, particularly during warmer months. The clay soils of the Chilterns also influence the persistence of particulate matter, as they tend to bind pollutants.

Marlow’s air quality exhibits a distinct seasonal pattern dictated by the interplay of meteorological factors. Winter months, typically December to February, often see a greater propensity for stagnant air conditions. Temperature inversions, where a layer of warm air traps cooler air near the ground, are more frequent during this period, hindering pollutant dispersal and leading to a build-up of emissions from domestic heating and road traffic. Fog, common in winter, further exacerbates this issue by trapping pollutants close to the ground. Spring (March-May) brings a gradual improvement as temperatures rise and wind speeds increase, aiding in the dispersion of pollutants. However, agricultural activities intensify during this season, potentially increasing ammonia levels. Summer (June-August) generally offers the best air quality, with consistent sunshine, higher wind speeds, and reduced domestic heating demand. However, hot, still days can occasionally lead to ozone formation, a secondary pollutant. Autumn (September-November) sees a transition period, with cooler temperatures and increased rainfall, which can help to wash pollutants from the atmosphere. However, the return of temperature inversions and fog in late autumn can again degrade air quality. Sensitive groups, such as children, the elderly, and individuals with respiratory conditions, should be particularly mindful of air quality forecasts during winter and early spring, limiting prolonged outdoor activity on days with poor air quality. During the warmer months, limiting strenuous activity during peak ozone hours (typically mid-afternoon) is advisable.