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Miraí, nestled in the mountainous region of Minas Gerais, Brazil, presents a unique geographic context influencing its air quality. Located at coordinates -21.1953, -42.6142, the city sits at an elevation of approximately 450 meters above sea level, within a landscape dominated by the Serra da Mantiqueira mountain range. This terrain significantly impacts air circulation, creating pockets where pollutants can accumulate. The surrounding area is characterized by a mix of Atlantic Forest remnants and agricultural land, primarily coffee plantations, a defining feature of the region. The Paraíba do Sul River flows nearby, offering some natural ventilation but also potentially contributing to humidity and fog formation, which can trap pollutants. Miraí’s urban character is that of a smaller, inland city, with a population of around 15,111, experiencing a relatively slow urban-rural gradient. While not a major industrial hub, localized industries related to agriculture and food processing exist, alongside residential wood burning for heating and cooking. The city’s position within a valley, shielded by mountains, limits long-range pollutant dispersion, making local emission sources particularly impactful on air quality. The topography encourages temperature inversions, especially during calmer periods, exacerbating pollution events.

Miraí experiences a distinct wet and dry season, heavily influencing its air quality. The dry season, typically from April to September, sees significantly reduced rainfall and increased dust from agricultural activities and unpaved roads. This period often coincides with higher concentrations of particulate matter, especially PM10, due to drier conditions and increased wind erosion. August and September are often the months with the poorest air quality, impacting those with respiratory sensitivities. Conversely, the wet season, from October to March, brings frequent rainfall which effectively washes away pollutants, leading to improved air quality. However, the increased humidity can also promote the formation of mold and allergens, posing a different set of health challenges. Temperature inversions are more common during the cooler, drier months, trapping pollutants near ground level. Fog, prevalent during the transition seasons, can further exacerbate this effect. Sensitive groups, including children, the elderly, and individuals with asthma, should limit strenuous outdoor activity during the dry season and periods of fog. Monitoring local conditions and adjusting activity levels accordingly is crucial for maintaining respiratory health throughout the year.