Garanhuns Air Quality Index (AQI)

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Garanhuns, nestled in the Agreste region of Pernambuco, Brazil, presents a unique geographic setting influencing its air quality. Situated at coordinates -8.8903, -36.4928, the city occupies a transitional zone between the coastal Mata Atlântica forest and the semi-arid Sertão. This location, at an elevation of approximately 880 meters (2,887 feet), contributes to cooler temperatures than the coastal plains, but also influences atmospheric circulation. The surrounding landscape is characterised by rolling hills and valleys, interspersed with patches of remaining Atlantic Forest. Garanhuns isn’t directly adjacent to major bodies of water, though rivers like the Ipojuca traverse the region, impacting local humidity. While not a heavily industrialised centre, the surrounding areas support significant agricultural activity, particularly sugarcane and fruit cultivation. This agricultural land use introduces potential sources of particulate matter from field preparation, harvesting, and burning practices. The urban-rural gradient is relatively sharp, with agricultural lands immediately bordering the city limits. This proximity means that air quality within Garanhuns is susceptible to pollutants transported from these rural activities, alongside emissions from vehicle traffic and domestic fuel burning within the city itself. The topography, with its undulating terrain, can also trap pollutants, exacerbating localised air quality issues.

Garanhuns experiences a distinct wet and dry season, rather than traditional four seasons. Air quality in Garanhuns is most compromised during the dry season, typically from August to December. This period sees reduced rainfall, leading to increased dust and particulate matter suspension from agricultural activities and unpaved roads. Lower humidity also means pollutants are less likely to be washed out of the atmosphere. Temperature inversions, common during cooler nights in the dry season, trap pollutants near ground level, worsening air quality. The wet season, from January to July, generally brings improved air quality as rainfall effectively cleanses the atmosphere. However, even during the wet season, localised pollution can occur due to vehicle emissions and domestic burning. February and March, often the wettest months, are generally the most favourable for outdoor activities. Sensitive groups – children, the elderly, and those with respiratory conditions – should be particularly cautious during the dry season, limiting strenuous outdoor activity and monitoring their health. Periods of intense agricultural burning, even within the wet season, can cause temporary spikes in pollution. Wind patterns, generally easterly, can transport pollutants from agricultural zones towards the city.