Mella Air Quality Index (AQI)

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Mella, nestled in the eastern province of Santiago de Cuba, occupies a geographically complex position. The city sits within a valley, cradled by the Sierra Maestra mountains to the south and the coastal plains extending north towards the Caribbean Sea. Its coordinates (20.3694, -75.9111) place it approximately 30 kilometers inland from the coast, influencing its climate and air quality. The terrain is undulating, transitioning from mountainous slopes to flatter agricultural lands surrounding the urban core. This proximity to both mountainous regions and the sea creates unique meteorological conditions. The surrounding landscape is dominated by lush tropical vegetation, sugarcane plantations, and coffee farms, contributing to both biogenic volatile organic compounds (BVOCs) and potential agricultural burning emissions. Mella’s urban-rural gradient is relatively sharp, with agricultural areas immediately bordering the city limits. While not a major industrial hub, the presence of smaller-scale processing facilities related to agriculture and food production contributes to localised pollution sources. The valley location can trap pollutants, particularly during periods of calm winds, exacerbating air quality issues. The prevailing trade winds, however, generally offer some dispersion, though their effect is modulated by the surrounding topography. The city’s elevation, around 70 meters above sea level, further influences atmospheric mixing and pollutant dispersal.

Mella experiences a distinct wet and dry season, rather than traditional four seasons. Air quality in Mella is most favourable during the wet season (May to October), when frequent rainfall effectively washes particulate matter from the atmosphere. The increased humidity, however, can also promote the formation of mould and allergens, impacting respiratory health. The dry season (November to April) presents the greatest air quality challenges. Reduced rainfall leads to a build-up of dust, particularly from agricultural activities and unpaved roads. January and February are typically the driest months, coinciding with increased agricultural burning for sugarcane harvesting, significantly elevating particulate matter levels. Temperature inversions, common during the cooler, drier months, trap pollutants near the ground, worsening conditions. Calm wind conditions during these periods further exacerbate the problem. Sensitive groups – children, the elderly, and those with respiratory conditions – should limit strenuous outdoor activity during the dry season, especially in January and February. The trade winds offer some relief, but their influence is variable. Monitoring local conditions is crucial. Increased pollen counts during the transition periods (April/May and October/November) can also trigger respiratory issues.