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Doncaster, a town situated in South Yorkshire, England, occupies a geographically significant position within the broader Humber region. Its coordinates (53.5228, -1.1325) place it on relatively flat terrain, part of the Trent Valley, a broad floodplain carved by the River Don and its tributaries. The surrounding landscape is a blend of agricultural land – predominantly arable fields – and pockets of woodland, reflecting the area’s historical reliance on farming and more recent industrial development. Doncaster’s proximity to the Humber Estuary, a vital waterway for trade and industry, influences local weather patterns and, historically, has contributed to industrial emissions. The urban fabric is characterized by a gradual urban–rural gradient; the town centre is densely built, transitioning outwards to suburban residential areas and then to the agricultural fields that define much of the surrounding countryside. Elevation is minimal, rarely exceeding 50 meters above sea level, which can exacerbate air pollution episodes as there is limited natural dispersion of pollutants. The town’s location within the historically significant coalfield belt has left a legacy of industrial activity, though much of the heavy industry has declined. The River Don, while providing a scenic element, also carries potential pollutants from upstream sources. The prevailing westerly winds, common to this part of the UK, can transport pollutants from industrial areas further west and southwest, impacting Doncaster's air quality. The relatively flat topography limits the natural ventilation, contributing to localised pollution build-up, particularly during periods of stagnant weather.

Doncaster’s air quality experiences a distinct seasonal cycle, largely dictated by meteorological conditions. Winter months (November to February) often present the greatest challenges. Cold temperatures lead to increased domestic heating reliant on solid fuels, contributing to particulate matter (PM) pollution. Furthermore, temperature inversions – where a layer of warm air traps cooler air near the ground – are more frequent during winter, preventing the vertical dispersion of pollutants. Fog, a common occurrence in the Trent Valley, further exacerbates this issue by trapping pollutants close to the surface. Spring (March to May) typically sees an improvement as temperatures rise and wind speeds increase, aiding in pollutant dispersal. However, agricultural activities, such as ploughing and fertilizer application, can temporarily elevate ammonia levels. Summer (June to August) generally offers the best air quality, with consistent winds and higher temperatures promoting good ventilation. However, occasional heatwaves can lead to ozone formation, a secondary pollutant. Autumn (September to October) marks a transitional period, with decreasing temperatures and increasing rainfall, which can wash pollutants from the atmosphere. Individuals with respiratory conditions, such as asthma, should be particularly cautious during winter months, limiting outdoor activity on days with poor visibility. Children and the elderly are also more vulnerable and should take precautions. During agricultural periods, those sensitive to ammonia should avoid prolonged exposure near farmland. Overall, spring and summer offer the most favourable conditions for outdoor pursuits, while winter requires heightened awareness and preventative measures.