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Rockhampton, situated in central Queensland, Australia, occupies a unique geographic position at the mouth of the Fitzroy River, approximately 600km northwest of Brisbane. The city sprawls across a relatively flat coastal plain, gently rising towards the Berserker Ranges to the west and the Capricorn Coast to the east. This terrain significantly influences air quality, as the ranges can trap pollutants during stable atmospheric conditions, while sea breezes offer periods of dispersion. Rockhampton’s urban character is defined by its historical beef cattle industry, evidenced by the extensive cattle yards and associated processing facilities, which contribute to localised particulate matter. Surrounding the city is a mosaic of agricultural land – primarily grazing – and remnant bushland. The Fitzroy River, a tidal estuary, plays a crucial role in the regional ecosystem and can influence humidity levels, impacting pollutant behaviour. The urban-rural gradient is relatively sharp, transitioning quickly from residential areas to expansive pastoral holdings. Industrial activity is concentrated along the riverfront and in designated industrial zones, creating point sources of potential air pollution. The city’s location experiences a subtropical climate, with warm, humid summers and mild, dry winters, further shaping air quality dynamics.

Rockhampton’s air quality follows a distinct seasonal pattern largely dictated by its subtropical climate and meteorological conditions. The dry season (May to October) generally presents the best air quality, with consistent southeast trade winds dispersing pollutants effectively. However, winter temperature inversions, particularly during calm, clear nights, can trap smoke from domestic wood heaters and localised industrial emissions, leading to elevated particulate matter concentrations. The wet season (November to April) brings increased humidity and potential for monsoon troughs, which can temporarily improve air quality through rainfall scavenging of pollutants. However, intense rainfall can also lead to increased mould spore counts, impacting respiratory health. February and March, during peak cyclone season, can experience strong winds that both disperse and concentrate pollutants depending on wind direction. Bushfire smoke from surrounding areas is a significant concern during late spring and summer. Sensitive groups – children, the elderly, and those with respiratory conditions – should limit strenuous outdoor activity during periods of smoke haze or temperature inversions. Monitoring conditions and staying indoors with air conditioning during peak pollution events is advised.