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Muaná, nestled in the state of Pará, Brazil, occupies a unique geographic position at the mouth of the Amazon River, where it meets the Atlantic Ocean. Located at -1.5283 latitude and -49.2167 longitude, the city’s terrain is predominantly low-lying, a characteristic floodplain environment. The elevation is minimal, contributing to limited natural air dispersion. Muaná’s urban character is defined by its riverine connections; it’s a crucial port for regional trade, particularly in açaí, a fruit heavily cultivated in the surrounding várzea (flooded forest). The surrounding landscape is dominated by dense Amazon rainforest, interspersed with agricultural areas focused on fruit production and small-scale farming. The urban-rural gradient is relatively blurred, with agricultural activities extending close to the city center. This proximity to agricultural practices, including potential slash-and-burn techniques, significantly impacts local air quality. The constant humidity and proximity to the ocean introduce salt spray into the air, while the river itself acts as a conduit for pollutants from upstream sources. Industrial activity is limited within Muaná itself, but regional transport, particularly river traffic, contributes to emissions. The city’s location within the equatorial climate zone means consistent high temperatures and humidity, influencing pollutant behaviour.

Muaná experiences a distinct wet and dry season rather than traditional four seasons. Air quality is generally poorer during the dry season (roughly July to December). Reduced rainfall means less atmospheric cleansing, allowing particulate matter from agricultural burning and river traffic to accumulate. Lower humidity can also lead to increased dust suspension. August and September are typically the months with the most noticeable air quality decline. The dry season also sees increased forest fires, both natural and human-induced, contributing significantly to smoke and haze. Conversely, the wet season (January to June) brings substantial rainfall, effectively washing pollutants from the atmosphere. February and March often experience the clearest air. However, the increased humidity during the wet season can promote mold growth, impacting respiratory health. Temperature inversions, though less frequent than in temperate climates, can occur during calmer periods, trapping pollutants near the ground. Sensitive groups – children, the elderly, and those with respiratory conditions – should limit strenuous outdoor activity during the dry season and monitor their health closely. During the wet season, while air quality is better, precautions against mold exposure are advisable.