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Tecpán, Guatemala, nestled within the department of Chimaltenango, occupies a strategically important position in the Guatemalan highlands. Located at approximately 14.7667° latitude and -91.0000° longitude, and with a population of 112,864, the city’s geography significantly influences its air quality. The surrounding landscape is dominated by the Sierra Madre de Gualán, a range of volcanic mountains that create a bowl-like topography. This terrain, combined with an elevation of around 1,850 meters (6,070 feet) above sea level, contributes to a tendency for temperature inversions, particularly during the drier months. The city sits within a transitional zone between the central highlands and the Pacific coastal plain, impacting prevailing wind patterns. While not directly adjacent to major bodies of water, the nearby Suchitepéquez department contains smaller rivers and streams, which can influence local humidity and atmospheric stability. The urban–rural gradient around Tecpán is relatively sharp; the city is surrounded by agricultural lands, primarily dedicated to maize, beans, and coffee cultivation. These agricultural practices, including the use of fertilizers and occasional burning of fields, can contribute to localized air pollution. Further afield, the Pacific industrial belt, though not immediately proximate, can occasionally influence regional air quality through long-range transport of pollutants. The mountainous terrain restricts airflow, potentially trapping pollutants within the valley, and the city’s growth, while moderate, introduces local sources of emissions from vehicles and residential heating.

Tecpán experiences a tropical highland climate, characterized by distinct wet and dry seasons rather than the four traditional seasons. The dry season, typically spanning November to April, presents the most significant air quality challenges. Reduced rainfall leads to lower atmospheric cleansing, and the stable airmasses associated with high-pressure systems frequently result in temperature inversions. These inversions trap pollutants near the ground, exacerbating existing emissions. Agricultural burning, often practiced to clear land for planting, is most prevalent during this period, releasing particulate matter and other harmful compounds. The months of January and February often see the poorest air quality due to a combination of these factors. Conversely, the wet season (May to October) brings increased rainfall and higher humidity, which naturally washes pollutants from the atmosphere and promotes better ventilation. Stronger winds associated with the onset of the monsoon season also help disperse pollutants. Fog, common during the wet season, can temporarily reduce visibility but generally doesn't significantly worsen air quality compared to the stagnant conditions of the dry season. Sensitive groups, including children, the elderly, and individuals with respiratory conditions, should exercise caution during the dry season, limiting outdoor activities during peak pollution periods, typically in the mornings. Maintaining indoor air quality through proper ventilation and air filtration can also be beneficial. The transition months of April and October offer a more moderate air quality profile, representing optimal times for outdoor recreation.