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Worthing is a coastal town in West Sussex, England, situated on the south coast facing the English Channel, with its urban character defined by its seaside location and position within the wider South East England region. The town lies on a relatively flat coastal plain at low elevation, typically under 10 metres above sea level, bordered to the north by the rolling chalk hills of the South Downs, which rise to over 200 metres, creating a distinct urban–rural gradient. This geography significantly influences air quality: the coastal position generally promotes good air dispersion due to prevailing south-westerly winds from the ocean, but the proximity to the South Downs can occasionally trap pollutants under specific meteorological conditions, particularly during temperature inversions. Worthing is part of a largely residential and service-based urban area, with limited heavy industry; pollution sources are primarily from general urban activities like road traffic, domestic heating, and some light commercial operations. The surrounding landscape includes agricultural zones to the north and east, contributing minimal agricultural emissions compared to more intensive farming regions. The town's location away from major industrial belts, such as those in northern England, generally results in lower baseline pollution levels, though its position along the busy A27 corridor and proximity to larger urban centres like Brighton can lead to transported pollutants. The English Channel acts as a moderating influence, reducing extreme pollution events common in inland cities, but sea breezes can sometimes recirculate local emissions.

In Worthing, air quality varies seasonally due to meteorological factors and human activities, with a narrative that guides residents and visitors on optimal times for outdoor pursuits. During spring (March to May), conditions are generally favourable as increasing daylight and moderate temperatures reduce heating demands, while prevailing westerly winds from the Atlantic disperse pollutants effectively; this season is ideal for outdoor activities, with sensitive groups like asthmatics experiencing fewer issues. Summer (June to August) sees peak tourism and traffic, potentially elevating local emissions, but sea breezes and higher atmospheric mixing heights typically maintain good air quality, though occasional heatwaves can lead to ozone formation from vehicle exhausts—outdoor exercise is best scheduled for mornings or evenings to avoid midday peaks. Autumn (September to November) brings cooler temperatures and increased domestic heating, raising particulate matter levels from wood burners and boilers, while calmer winds and foggy conditions, especially in October and November, can trap pollutants near the ground; sensitive individuals should monitor air quality forecasts and limit prolonged exposure on still days. Winter (December to February) often has the poorest air quality due to temperature inversions, where cold air traps emissions from heating and traffic under a warmer layer, exacerbated by low wind speeds and frequent fog—months like January and February are particularly challenging, with health guidance advising vulnerable groups to avoid strenuous outdoor activities during pollution alerts and use indoor air purifiers if necessary. Overall, late spring and early autumn offer the most consistent conditions for outdoor enjoyment.