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Altrincham, nestled within the Metropolitan Borough of Trafford in Greater Manchester, occupies a relatively flat landscape characteristic of the Cheshire Plain. Situated at coordinates 53.3838° N, -2.3547° W, the town benefits from a location approximately 8 miles southwest of Manchester city centre. Historically an agricultural market town, Altrincham’s geography has been significantly shaped by its proximity to the River Mersey and the Bridgewater Canal, both vital for transport and industry. The surrounding landscape is a mosaic of suburban development, green spaces, and remnants of agricultural land, transitioning to more rural areas further west. This urban-rural gradient influences air quality; while Altrincham itself experiences emissions from road traffic and domestic heating, prevailing westerly winds can carry pollutants from the larger industrial areas of Manchester and the M60 orbital motorway. The relatively low elevation (around 60m) and frequent temperature inversions, particularly during winter, can trap pollutants near ground level. The town’s position within the Greater Manchester conurbation means it’s susceptible to regional pollution events, rather than being isolated from wider air quality trends. The canal corridors, while aesthetically pleasing, can also act as channels for stagnant air, exacerbating localised pollution.

Altrincham’s air quality follows a distinct seasonal pattern. Winter (December-February) typically sees the poorest air quality, driven by increased reliance on domestic heating, particularly solid fuel burning, coupled with colder temperatures and frequent temperature inversions that trap pollutants. Calm, still conditions are common, preventing dispersion. Spring (March-May) brings gradual improvement as temperatures rise and heating demand decreases, though pollen becomes a significant concern for allergy sufferers. Summer (June-August) generally offers the cleanest air, aided by prevailing winds and higher temperatures promoting pollutant dispersal. However, increased road traffic during the holiday season can locally elevate nitrogen dioxide levels. Autumn (September-November) sees a deterioration as heating use increases again, and damp conditions can lead to increased particulate matter from road wear. Fog, common in autumn and winter, further reduces visibility and exacerbates pollution. Sensitive groups – children, the elderly, and those with respiratory conditions – 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 advisable. The wet season, generally spanning autumn and winter, can temporarily improve air quality through rainfall scavenging, but also increases humidity and potential for damp-related indoor pollutants.