San Bartolo Air Quality Index (AQI)

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San Bartolo, nestled within the department of Totonicapán in Guatemala, occupies a geographically significant position within the Guatemalan Highlands. Located at approximately 15.0844° latitude and -91.4558° longitude, the town sits at a considerable elevation of around 2,200 meters (7,218 feet) above sea level. This high-altitude location profoundly influences its climate and, consequently, its air quality. The surrounding landscape is characterized by steep, rolling hills and valleys, typical of the volcanic terrain that defines the region. The town is situated within a predominantly rural area, exhibiting a gradual urban–rural gradient as one moves outwards. While San Bartolo itself is a small municipality, it’s part of a larger network of highland communities. Agriculture is a dominant land use in the vicinity, with maize, beans, and coffee cultivation being prevalent. These agricultural practices, particularly the burning of fields after harvest, can contribute to localized air pollution events. The town’s proximity to larger urban centers like Quetzaltenango, though not immediately adjacent, means it can be affected by regional pollution transport. The terrain itself, with its enclosed valleys, can trap pollutants, especially during periods of low wind. The lack of significant nearby bodies of water further limits natural air purification processes. The limited industrial activity within San Bartolo itself means that pollution sources are primarily related to residential heating (wood-burning stoves) and agricultural practices, rather than large-scale industrial emissions, though regional industrial belts can still impact air quality.

San Bartolo’s air quality follows a distinct seasonal pattern dictated by Guatemala’s tropical highland climate, characterized by a pronounced wet and dry season. The dry season, typically spanning November through April, often sees a noticeable increase in particulate matter. This is largely attributable to agricultural burning practices, as farmers clear fields for the next planting cycle. The drier conditions also mean reduced rainfall to wash pollutants from the atmosphere. Temperature inversions, common during the cooler nights of the dry season, trap pollutants close to the ground, exacerbating the issue. Conversely, the wet season (May to October) brings increased rainfall, which naturally helps to cleanse the air, leading to improved air quality. However, periods of heavy fog, particularly in the mornings, can temporarily reduce visibility and trap moisture-borne pollutants. Wind patterns also play a crucial role; calmer conditions during the dry season allow pollutants to accumulate, while stronger winds during the wet season disperse them. Sensitive groups, including children, the elderly, and individuals with respiratory conditions, should exercise caution during the dry season, particularly in the mornings when fog is prevalent. Outdoor activities are generally more favorable during the wet season, although periods of intense rainfall can still impact air quality due to runoff carrying pollutants. The months of January and February often experience the poorest air quality due to the peak of agricultural burning, while May and June typically offer the cleanest air following the onset of the rainy season.