Ilhota Air Quality Index (AQI)

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Ilhota, nestled in the Itajaí Valley of Santa Catarina, Brazil, presents a unique geographic context influencing its air quality. Located at -26.9000, -48.8269, the city sits within a relatively flat coastal plain, though gently undulating terrain rises towards the Serra Geral foothills to the west. This positioning is crucial; the valley acts as a funnel, potentially trapping pollutants during periods of atmospheric stability. The Itajaí-Mirim River flows nearby, providing a vital waterway but also contributing to humidity which can exacerbate certain pollution events. Ilhota’s urban character is transitioning, with a growing population of 17,046 experiencing increasing development. Surrounding the city are significant agricultural zones, particularly rice paddies and fruit orchards, alongside emerging industrial activity related to textiles and light manufacturing. This blend of agriculture and industry introduces diverse emission sources. The urban-rural gradient is relatively sharp, with quickly transitioning land use patterns. Proximity to the port city of Itajaí, a major logistical hub, also means potential for transport-related pollution drift. The prevailing winds, generally from the southeast, can carry pollutants from coastal industrial areas inland, impacting Ilhota’s air quality.

Ilhota’s air quality follows a pattern dictated by Santa Catarina’s subtropical climate. The warmer months, December through February, often see increased humidity and stagnant air, leading to a build-up of locally generated pollutants from agricultural activities like burning of crop residue and increased vehicle traffic during the tourist season. While rainfall can offer temporary relief, it also washes particulate matter into waterways. Autumn (March-May) brings more stable atmospheric conditions and potential for temperature inversions, trapping pollutants near the ground. This period can be challenging for those with respiratory sensitivities. Winter (June-August) is generally drier, with stronger winds that can disperse pollutants, offering some improvement in air quality, though wood burning for heating can become a localised concern. Spring (September-November) sees a transition period, with increasing rainfall and temperatures. This is generally the most favourable time for outdoor activity. Fog events, common in the cooler months, can trap pollutants and reduce visibility. Sensitive groups – children, the elderly, and those with pre-existing respiratory conditions – should limit strenuous outdoor activity during periods of stagnation, particularly in autumn and early winter.