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Pampas, nestled within the Huancavelica region of Peru, occupies a geographically significant position in the Peruvian Andes. Located at approximately -12.3989° latitude and -74.8667° longitude, the city sits at a considerable elevation of around 3,800 meters (12,467 feet) above sea level. This high altitude immediately influences air quality, impacting atmospheric pressure and oxygen levels. The surrounding landscape is dominated by the rugged, semi-arid terrain characteristic of the Andean highlands. Steep slopes and valleys define the area, limiting expansive urban sprawl and creating a distinct urban–rural gradient. Pampas itself is a relatively small, compact settlement, reflecting its modest population of 11,566. The city’s proximity to the Mantaro River, though not directly adjacent, provides a crucial water source for the region and influences local microclimates. While Pampas isn't situated directly within a major industrial belt, it’s part of a broader agricultural zone where small-scale farming, often involving traditional practices like burning vegetation for land clearing, can contribute to localized air pollution events. The terrain’s topography, combined with the high elevation, frequently leads to temperature inversions, particularly during the cooler months, trapping pollutants near the ground. The surrounding mountains act as barriers, hindering the dispersion of airborne particles and gases, further exacerbating air quality challenges. The limited flat land also restricts urban development patterns, concentrating activities within a smaller area.

Pampas experiences a distinct wet and dry season pattern, significantly impacting its air quality throughout the year. The dry season, typically spanning from May to September, is often characterized by clear skies and intense solar radiation. However, this period also sees a marked increase in particulate matter pollution. The lack of rainfall allows dust and smoke from agricultural burning to accumulate, and the stable atmospheric conditions, frequently featuring temperature inversions, prevent effective dispersion. These inversions trap pollutants close to the ground, creating stagnant air masses. The dry winds, while sometimes offering some ventilation, can also carry dust from surrounding agricultural lands. Conversely, the wet season, from October to April, brings increased rainfall, which naturally helps to cleanse the atmosphere, washing away particulate matter and reducing overall pollution levels. Fog, common during the wet season, can also temporarily trap pollutants in localized areas, but the frequent precipitation generally outweighs this effect. During the transition months (April/May and September/October), air quality can be particularly variable, influenced by shifting wind patterns and the interplay between dry and wet season conditions. Sensitive groups, including children, the elderly, and individuals with respiratory conditions, should exercise caution during the dry season, limiting strenuous outdoor activities during peak pollution periods. The cooler temperatures during the dry season can also exacerbate respiratory issues, making it crucial to stay indoors when air quality is poor.