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Twickenham, nestled within the London Borough of Richmond upon Thames, occupies a geographically significant position along the River Thames, approximately 9.5 miles (15 km) west-southwest of central London. Its location within the Greater London urban area dictates a complex interplay of urban and suburban characteristics. The terrain is gently undulating, rising slightly away from the riverbank, with pockets of green space interspersed amongst residential areas. The surrounding landscape is predominantly suburban, transitioning to more rural areas further west towards Richmond Park and beyond. The Thames itself exerts a considerable influence, moderating temperatures and occasionally contributing to localised fog conditions, particularly during cooler months. While Twickenham lacks significant heavy industry within its immediate boundaries, it sits within commuting distance of industrial belts further east and north within Greater London, impacting background pollution levels. The urban–rural gradient is relatively gradual, with a mix of detached houses, semi-detached properties, and smaller apartment buildings defining the urban character. The proximity to Heathrow Airport, though not directly adjacent, introduces a source of aircraft emissions, particularly noticeable along flight paths. Elevation is relatively low, averaging around 15-30 meters above sea level, which can exacerbate the trapping of pollutants under certain meteorological conditions. The borough's commitment to green infrastructure, including parks and riverside walkways, attempts to mitigate some of these impacts, but the overall air quality remains influenced by regional and national pollution trends.

Twickenham’s air quality experiences a distinct seasonal pattern driven by meteorological factors. Winter months (November to February) often see the poorest air quality, frequently influenced by temperature inversions. These inversions trap cooler air near the ground, preventing pollutants from dispersing upwards, leading to increased concentrations of particulate matter and nitrogen oxides. Fog, common during this period due to the Thames’ moderating effect and cooler temperatures, further exacerbates this issue by reducing visibility and hindering pollutant dispersal. Spring (March to May) brings a gradual improvement as temperatures rise and wind speeds increase, aiding in the ventilation of pollutants. Summer (June to August) generally offers the best air quality, with consistent breezes and warmer temperatures promoting dispersion. However, occasional heatwaves can lead to stagnant air and increased ozone levels. Autumn (September to October) sees a transitional period, with decreasing sunlight and increasing rainfall, which can help to wash pollutants from the atmosphere, but also brings a return of cooler temperatures and the potential for inversions. Sensitive groups, including children, the elderly, and individuals with respiratory conditions, should be particularly cautious during winter mornings and periods of stagnant air. Outdoor activities are generally best enjoyed during the summer months, avoiding peak traffic times. Increased rainfall throughout the year helps to cleanse the atmosphere, but the overall air quality remains susceptible to regional pollution events and the impact of nearby transport infrastructure.