Dois Irmãos Air Quality Index (AQI)

Loading live AQI data...

Loading historical AQI trends...

Dois Irmãos, nestled in the Serra Gaúcha region of Rio Grande do Sul, Brazil, occupies a geographically significant position within a landscape characterized by rolling hills and valleys. Located approximately 85 kilometers northwest of Porto Alegre, the state capital, the city’s coordinates (-29.5800, -51.0850) place it at an elevation of roughly 550 meters above sea level, contributing to a generally cooler climate compared to coastal areas. The surrounding terrain is predominantly agricultural, with extensive vineyards and apple orchards defining the rural character of the region. This proximity to agricultural zones introduces potential sources of air pollution, particularly during harvest seasons and periods of pesticide application. The urban fabric of Dois Irmãos is relatively compact, exhibiting a clear urban–rural gradient as one moves outwards from the central area. While not directly adjacent to a major river, the city benefits from the presence of smaller streams and tributaries that contribute to the local microclimate. The Serra Gaúcha’s topography, with its ridges and valleys, can influence local wind patterns, potentially trapping pollutants in certain areas under specific meteorological conditions. The absence of large-scale industrial belts within the immediate vicinity is a positive factor, though transportation corridors connecting Dois Irmãos to Porto Alegre and other regional centers can introduce vehicular emissions. The overall landscape is a mosaic of cultivated fields, forested areas, and residential zones, shaping the city’s air quality profile.

Dois Irmãos experiences a distinct temperate climate with four seasons, significantly impacting its air quality throughout the year. Spring (September-November) typically brings clearer skies and improved air quality as temperatures rise and rainfall increases, dispersing any accumulated pollutants. However, agricultural activities intensify during this period, potentially leading to localized spikes in particulate matter from soil disturbance and fertilizer application. Summer (December-February) is generally characterized by warmer temperatures and occasional heatwaves, which can exacerbate ozone formation, a secondary pollutant. Stagnant air masses during these periods can trap pollutants, leading to poorer air quality. Autumn (March-May) often sees a gradual decline in air quality as cooler temperatures and increased humidity can lead to fog formation, particularly in the valleys, trapping pollutants close to the ground. This is often a period of heightened concern for sensitive individuals. Winter (June-August) is arguably the most challenging season for air quality. Cold temperatures frequently lead to temperature inversions, where a layer of warm air sits above cooler air near the ground, preventing vertical mixing and trapping pollutants. The prevalence of wood-burning stoves for heating during these months also contributes to particulate matter pollution. Residents, especially children, the elderly, and those with respiratory conditions, should limit outdoor exertion on days with visible haze or reduced visibility. Maintaining indoor air quality through ventilation and air purifiers is also advisable during winter months.