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Manhiça, situated in Maputo Province, Mozambique, lies approximately 60km north of the capital city, Maputo. Geographically, the area is characterised by a gently undulating coastal plain, transitioning inland to slightly higher ground. The city’s coordinates (-25.4000, 32.8000) place it within a subtropical climate zone, influenced by the warm Indian Ocean. The terrain is predominantly flat, facilitating agricultural activity, which dominates the surrounding landscape. Manhiça isn’t directly on the coast, but is close enough to experience maritime influences, including humidity and occasional coastal breezes. The Limpopo River basin is a significant feature of the regional geography, though Manhiça itself isn’t directly on the river. The urban-rural gradient is quite pronounced; the city centre is relatively compact, quickly giving way to agricultural lands and rural settlements. This proximity to agricultural zones introduces potential sources of particulate matter from land preparation, burning of crop residues, and fertilizer use. Limited industrial activity within Manhiça itself means that the primary air quality concerns are less related to heavy industry and more to localised sources like vehicle emissions, biomass burning for cooking, and dust from unpaved roads. The prevailing winds, generally from the southeast, can transport pollutants from Maputo, impacting Manhiça’s air quality.

Manhiça experiences a distinct wet and dry season, rather than traditional four seasons. Air quality generally improves during the wet season (November to April) due to rainfall effectively scavenging particulate matter from the atmosphere. However, increased humidity can also promote the formation of mould and allergens, impacting respiratory health. The peak of the wet season, January and February, often sees the cleanest air, though localised flooding can disrupt transport and increase reliance on vehicles. The dry season (May to October) brings consistently poorer air quality. This is driven by increased dust from unpaved roads and agricultural activities, and a greater reliance on biomass burning for cooking and heating. August and September are typically the worst months for air quality, with dry, stable atmospheric conditions leading to pollutant accumulation. Temperature inversions, common during the cooler dry season nights, trap pollutants near ground level. Sensitive groups – children, the elderly, and those with pre-existing respiratory conditions – should limit strenuous outdoor activity during these months. Monitoring wind patterns is crucial; winds from the south can bring pollutants from Maputo. Avoiding peak traffic hours and using well-ventilated cooking spaces are recommended mitigation strategies.