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Cajolá, nestled in the highlands of Quetzaltenango, Guatemala, occupies a geographically significant position within the Western Highlands region. Located at approximately 14.9167° N, -91.6167° W and an elevation of around 2,320 meters (7,610 feet) above sea level, the city experiences a cool, temperate climate characteristic of high-altitude environments. The surrounding landscape is dominated by steep, volcanic slopes and deep valleys, a legacy of the region's geological history. Cajolá sits within a network of interconnected valleys, influencing local wind patterns and contributing to potential air quality challenges. The municipality is bordered by agricultural lands, primarily dedicated to maize and bean cultivation, alongside coffee plantations – a vital economic driver for the region. This proximity to agricultural zones introduces potential sources of particulate matter, particularly during planting and harvesting seasons, and from the burning of agricultural waste. The urban–rural gradient is relatively sharp, with the city transitioning quickly into rural agricultural landscapes. While Cajolá lacks direct proximity to major rivers or lakes, the surrounding watersheds play a crucial role in the local hydrological cycle, influencing humidity and fog formation, both of which can impact air pollutant dispersion. The absence of large-scale industrial zones within the immediate vicinity mitigates some pollution risks, but transportation-related emissions and residential wood burning remain key factors shaping the city’s air quality profile. The terrain’s topography significantly influences air circulation, potentially trapping pollutants in certain areas during periods of low wind.

Cajolá’s air quality follows a distinct seasonal pattern dictated by Guatemala’s tropical highland climate, exhibiting a pronounced wet and dry season cycle. The dry season, typically spanning November through April, often sees a noticeable increase in particulate matter. This is largely attributable to reduced rainfall, which limits the natural cleansing effect of precipitation, and increased residential wood burning for heating and cooking, a common practice in the region. Temperature inversions, a meteorological phenomenon where cooler air is trapped beneath a layer of warmer air, are more frequent during the dry season, particularly in the early morning hours, hindering vertical mixing and concentrating pollutants near ground level. The wet season, from May to October, brings increased rainfall and higher humidity, generally leading to improved air quality as pollutants are washed from the atmosphere. However, periods of persistent fog, common during the wet season, can also trap pollutants, creating localized air quality concerns. Wind patterns are variable, with stronger winds typically occurring during the wet season, aiding in pollutant dispersal. Outdoor activities are generally more favorable during the wet season, although caution should be exercised during periods of dense fog. Sensitive groups, including children, the elderly, and individuals with respiratory conditions, should be particularly mindful of air quality during the dry season, limiting prolonged outdoor exposure during early morning hours when inversions are most likely. Agricultural burning, while less frequent than residential burning, can contribute to spikes in particulate matter during both seasons, particularly around harvest times.