Marechal Deodoro Air Quality Index (AQI)

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Marechal Deodoro, nestled in the Alagoas state of Brazil, occupies a geographically significant position along the northeastern coastline. Located at approximately -9.7103° latitude and -35.8950° longitude, the city’s terrain is characterized by a blend of coastal plains and gently undulating hills, rising to modest elevations inland. The municipality is directly adjacent to the Atlantic Ocean, with the extensive Praia do Amor beach defining its eastern boundary, significantly influencing local climate and wind patterns. Surrounding Marechal Deodoro is a mosaic of landscapes: to the north lie stretches of sugarcane plantations, a dominant agricultural feature of the Alagoas region, while to the west, the terrain gradually transitions into more rugged, forested areas. This proximity to agricultural zones introduces potential sources of particulate matter, particularly during harvest seasons when burning practices, though regulated, can still occur. The urban–rural gradient is relatively smooth, with smaller settlements and agricultural land interspersed within the municipality. The city itself exhibits a typical Brazilian coastal urban character, with a mix of residential areas, commercial centers, and tourism-related infrastructure. The prevailing easterly trade winds, common along the Brazilian coast, play a crucial role in dispersing pollutants, though their effectiveness can be diminished under certain meteorological conditions. The relatively small population of 52,380 contributes to a lower overall pollution burden compared to larger metropolitan areas, but localized sources like vehicle traffic and small-scale industries still impact air quality.

Marechal Deodoro experiences a tropical climate, defined by distinct wet and dry seasons rather than the four traditional seasons. The dry season, typically spanning from August to December, often sees a slight improvement in air quality due to reduced rainfall and lower humidity. However, this period can also be susceptible to stagnant air conditions, particularly during periods of high-pressure systems, which can trap pollutants closer to the ground. The wet season, from January to July, brings frequent rainfall and higher humidity, generally leading to a cleansing effect on the atmosphere as precipitation washes away particulate matter. However, intense storms can temporarily elevate particulate levels due to wind-driven dust and soil erosion. The months of March and April often experience a transitional period with increased wind variability and occasional fog, which can exacerbate air quality issues by trapping pollutants. During the sugarcane harvest season, which typically peaks between September and November, localized increases in particulate matter are possible due to agricultural burning, although enforcement of regulations aims to minimize this. Sensitive groups, including children, the elderly, and individuals with respiratory conditions, should be particularly mindful during periods of stagnant air or increased agricultural activity. While the coastal location generally promotes ventilation, periods of calm winds can lead to localized pollution build-up. Outdoor activities are generally favored during the wet season, but vigilance is advised during transitional periods and harvest season.