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Leigh, a town within the Metropolitan Borough of Wigan in Greater Manchester, England, occupies a geographically interesting position. Situated at coordinates 53.4975° N, -2.5150° W, the town lies on relatively flat terrain, characteristic of the Lancashire Plain, with an elevation generally below 50 metres. Historically, Leigh’s development was intrinsically linked to the canal network, particularly the Leeds and Liverpool Canal, which provided vital transport links for the coal mining and textile industries that once dominated the area. This proximity to waterways, while historically beneficial, can contribute to localised humidity and potential temperature inversions, trapping pollutants. The surrounding landscape is a mix of post-industrial land, reclaimed coalfields, and increasingly, agricultural zones to the east and south. The urban-rural gradient is relatively sharp, transitioning quickly to open countryside. Leigh’s location within the Greater Manchester conurbation means it’s influenced by regional pollution sources, but also benefits from some degree of dispersion due to prevailing westerly winds. The legacy of heavy industry, though diminished, continues to impact soil and potentially air quality through residual contaminants. The town’s compact urban form, combined with traffic density, creates localised pollution hotspots, particularly along major road corridors.

Leigh’s air quality follows a distinct seasonal pattern. Winter, from November to February, typically sees the poorest air quality. Lower temperatures lead to increased wood and solid fuel burning for heating, contributing to particulate matter (PM2.5 and PM10) concentrations. Still, damp conditions and frequent temperature inversions trap pollutants near ground level, reducing dispersion. Fog, common during these months, exacerbates this effect. Spring (March-May) brings gradual improvement as temperatures rise and heating demand decreases, though pollen becomes a significant allergen. Summer (June-August) generally offers the cleanest air, aided by stronger winds and higher temperatures promoting pollutant dispersal. However, increased ozone levels can occur on hot, sunny days. Autumn (September-October) sees a return to poorer conditions as heating use increases again, and leaf fall contributes to organic particulate matter. Sensitive individuals – those with respiratory conditions like asthma, the elderly, and young children – should be particularly cautious during winter and autumn. Avoiding strenuous outdoor activity on still, cold days is advisable. Monitoring local forecasts and limiting exposure during peak pollution periods is crucial for protecting health. The wet season, generally spanning autumn and winter, can temporarily improve air quality through rainfall scavenging of pollutants.