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Brighton, situated on the south coast of England within the unitary authority of Brighton and Hove, presents a unique geographic context influencing its air quality. The city sprawls across a series of chalk hills forming the South Downs, descending towards the English Channel. This topography creates a complex interplay of wind patterns, often channeling breezes along the coastline but also fostering localised temperature inversions, particularly during calmer periods. Brighton’s urban area is relatively compact, extending east-west along the coast, with a noticeable urban-rural gradient as one moves north towards the Downs. Historically, the city’s economy revolved around fishing and maritime trade, but tourism now dominates. While heavy industry is largely absent *within* Brighton itself, the wider region, particularly towards ports like Newhaven and Shoreham, experiences industrial activity contributing to regional background pollution. Agricultural land surrounds Brighton to the north and west, with potential for ammonia emissions from farming. The constant sea breezes generally provide some dispersion, but the city’s position within the Weald, a sheltered area, can trap pollutants, especially during anticyclonic conditions. The city’s elevation ranges from sea level to approximately 200m on the Downs, impacting local wind flow and pollutant distribution.

Brighton’s air quality follows a distinct seasonal pattern. Winter (December-February) often sees poorer air quality due to increased wood burning for heating and stable, cold air masses leading to temperature inversions, trapping pollutants near ground level. Low wind speeds exacerbate this, particularly in sheltered areas. Spring (March-May) brings improvement as temperatures rise and winds become more frequent, dispersing pollutants. However, pollen levels are high, impacting respiratory health. Summer (June-August) generally offers the cleanest air, benefiting from prevailing southwesterly winds and strong solar radiation which breaks down pollutants. However, increased road traffic due to tourism can locally elevate nitrogen dioxide levels. Autumn (September-November) sees a gradual decline in air quality as heating demand increases and meteorological conditions become more variable. Fog, common in autumn and winter, can trap pollutants, reducing visibility and worsening air quality. Sensitive individuals – those with asthma, COPD, or heart conditions – should be particularly cautious during winter and periods of fog. Monitoring conditions and limiting strenuous outdoor activity on high pollution days is advisable. Avoiding peak traffic hours can also reduce exposure.