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Bagua Grande, nestled within the Amazonas region of northern Peru, occupies a geographically significant position at approximately -5.7572° latitude and -78.4453° longitude. The city’s terrain is characterized by undulating hills and valleys, typical of the Andean foothills, with an elevation averaging around 650 meters above sea level. This elevation contributes to a unique microclimate, often experiencing cooler temperatures than lower-lying areas within the Amazon basin. Bagua Grande sits within a transitional zone, bordering both the Amazon rainforest to the east and the drier, more agricultural landscapes of the highlands to the west. The surrounding landscape is a mosaic of dense tropical forests, small-scale farms cultivating crops like coffee, bananas, and sugarcane, and scattered settlements. The Utcubamba River, a vital waterway, flows nearby, influencing local humidity and contributing to the region’s overall biodiversity. While Bagua Grande itself is a relatively compact urban center, it serves as a regional hub for agricultural trade, with surrounding areas dedicated to intensive farming practices. This proximity to agricultural zones, coupled with the presence of small-scale industries involved in processing agricultural products, introduces potential sources of air pollutants. The urban–rural gradient is relatively sharp, with the city transitioning quickly into agricultural land and then into dense forest, impacting air circulation patterns and potentially trapping pollutants under certain meteorological conditions. The city’s location within a river valley can also lead to localized fog formation, further influencing air quality.

Bagua Grande’s tropical climate dictates a distinct wet and dry season pattern, profoundly influencing its air quality. The wet season, typically spanning from November to April, brings consistent rainfall and high humidity. While the rain naturally helps to cleanse the atmosphere, the increased humidity can trap particulate matter, particularly during periods of reduced wind. The dry season, from May to October, is characterized by lower rainfall and increased sunshine. However, this period often sees a rise in air pollution due to several factors. Agricultural burning, a common practice for land clearing and crop residue disposal, intensifies during the dry season, releasing significant amounts of smoke and particulate matter. Reduced rainfall means less natural cleansing of the atmosphere, allowing these pollutants to accumulate. Temperature inversions, where cooler air is trapped beneath a layer of warmer air, are more frequent during the dry season, particularly in the mornings, preventing pollutants from dispersing vertically. Fog, common in the mornings due to the river’s influence and the valley topography, further exacerbates the problem by trapping pollutants close to ground level. Sensitive groups, including children, the elderly, and individuals with respiratory conditions, should exercise caution during the dry season, particularly during agricultural burning periods (typically August-September). Limiting outdoor activity during foggy mornings and avoiding areas near agricultural fields are advisable. The increased humidity during the wet season can also trigger respiratory issues in some individuals, so maintaining indoor air quality is important year-round.