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Guatajiagua, nestled within the Morazán department of El Salvador, occupies a geographically significant position within the eastern region of the country. Located at approximately 13.67° N, 88.20° W, the town sits amidst a landscape characterized by rolling hills and valleys, a typical feature of El Salvador’s central highlands gradually transitioning towards the coastal plains. The elevation, averaging around 600 meters above sea level, contributes to a cooler climate compared to the coastal areas, but also influences local air circulation patterns. The surrounding terrain is a mosaic of small-scale agriculture, primarily coffee and maize cultivation, interspersed with patches of secondary forest. This agricultural activity, while vital to the local economy, can contribute to localized air pollution through the burning of agricultural waste and the use of fertilizers. Guatajiagua’s proximity to the Río Sumpul, a major river forming part of the border with Honduras, provides a source of water but also introduces potential for humidity and fog, which can trap pollutants under certain meteorological conditions. The urban–rural gradient around Guatajiagua is relatively gradual; the town itself is a modest settlement, and the surrounding area is predominantly rural, with small villages and farms. There are no major industrial belts immediately adjacent to Guatajiagua, but the broader eastern region experiences some light industrial activity, and transport routes connecting to larger urban centers like Usulután could contribute to transboundary pollution events. The topography, combined with prevailing wind patterns, dictates how pollutants disperse, often leading to localized concentrations within the valleys.

Guatajiagua’s tropical climate dictates a wet and dry season pattern, significantly influencing air quality dynamics. The dry season, typically spanning November to April, often sees a reduction in overall rainfall, leading to lower humidity and increased solar radiation. While this might seem beneficial, the lack of rainfall means fewer opportunities for natural pollutant washout. Temperature inversions, common during the cooler nights of the dry season, trap cooler air and pollutants near the ground, exacerbating localized air quality issues. Agricultural burning, a practice often employed to clear land for planting at the start of the dry season, contributes significantly to particulate matter pollution during these months. The wet season, from May to October, brings frequent rainfall, which naturally cleanses the atmosphere, reducing the concentration of many pollutants. However, heavy rainfall can also lead to increased soil erosion and the suspension of dust particles, temporarily impacting air quality. Fog, particularly prevalent during the transition periods between seasons, can also trap pollutants, creating periods of reduced visibility and elevated concentrations. Outdoor activities are generally more favorable during the wet season, particularly during the mid-morning and afternoon when rainfall is less frequent. Sensitive groups, including children, the elderly, and individuals with respiratory conditions, should exercise caution during the dry season, especially during periods of agricultural burning or when temperature inversions are present. Staying indoors during peak pollution events and avoiding strenuous outdoor activity are recommended during these times.