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Nestled in the Magdalena River Valley of southwestern Colombia, Neiva serves as the capital of Huila Department, positioned at coordinates 2.9345°N, -75.2809°W. This city of approximately 380,000 residents sits at an elevation of 442 meters above sea level, within a transitional zone between the Andean foothills to the west and the vast eastern plains (Llanos Orientales). Neiva's urban character blends colonial architecture with modern development, sprawling along the banks of the Magdalena River—Colombia's principal waterway—which flows northward through the city center. The surrounding landscape features rolling hills and agricultural zones, particularly coffee plantations and rice paddies, creating an urban–rural gradient where farming activities intersect with urban emissions. Neiva's location in this valley basin significantly impacts air quality, as the encircling topography can trap pollutants from general urban sources like vehicle traffic, residential heating, and occasional agricultural burning. The city's position along major transportation routes connecting Bogotá to southern Colombia contributes to diesel exhaust emissions, while its proximity to the Magdalena River provides some atmospheric moisture but limited dispersion pathways. The valley's microclimate, characterized by warm temperatures year-round, can enhance photochemical reactions that transform primary pollutants into secondary particulates, particularly during dry periods when dust from unpaved roads and construction sites adds to the particulate burden.

Neiva experiences a tropical savanna climate with distinct wet and dry seasons that profoundly influence air quality patterns throughout the year. During the dry season from December through March, reduced rainfall and stable atmospheric conditions often lead to pollution accumulation, with January and February typically seeing the highest particulate concentrations as dust from unpaved surfaces remains suspended and temperature inversions trap vehicle emissions in the valley basin. The wet season from April to November brings relief through frequent afternoon thunderstorms that scrub pollutants from the air, with May through July offering the cleanest conditions for outdoor activities. However, the transitional months of October and November can see occasional haze from agricultural burning in surrounding rural areas as farmers prepare fields for new planting cycles. Sensitive groups including children, elderly residents, and those with respiratory conditions should limit prolonged outdoor exertion during late morning hours in the dry season when ozone levels tend to peak. The city's consistent warm temperatures (averaging 28°C year-round) mean air conditioning use is minimal, reducing energy-related emissions but increasing reliance on natural ventilation that can introduce outdoor pollutants indoors. Early mornings generally provide better air quality before traffic builds up, while evenings during the dry season may see pollution accumulation as winds diminish and the valley cools.