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Mabai, nestled within the Yunnan province of southwestern China, occupies a geographically complex position at coordinates 23.0128°N, 104.4508°E. The city’s terrain is characterised by rolling hills and valleys, typical of the Yunnan-Guizhou Plateau, with an elevation around 1,800 meters. This altitude significantly influences atmospheric conditions, contributing to cooler temperatures and increased potential for temperature inversions. Mabai is not directly adjacent to major bodies of water, though smaller rivers and streams dissect the landscape, originating from the surrounding mountainous regions. The surrounding area is predominantly agricultural, with significant cultivation of crops like sugarcane and rice, alongside pockets of smaller-scale industry focused on agricultural processing. The urban-rural gradient is relatively sharp; Mabai itself is a compact urban centre, quickly transitioning to rural farmland and forested hillsides. This proximity to agricultural land introduces potential sources of particulate matter from burning agricultural waste and fertilizer use. The city’s location within a basin-like structure can also trap pollutants, exacerbating air quality issues, particularly during periods of calm weather. The regional climate is subtropical highland, influencing pollutant dispersion patterns. Understanding this interplay of topography, land use, and climate is crucial for assessing Mabai’s air quality challenges.

Mabai’s air quality follows a distinct seasonal pattern dictated by the region’s subtropical highland monsoon climate. The dry season, spanning roughly November to April, typically sees poorer air quality. Reduced rainfall means less atmospheric cleansing, and increased reliance on coal for heating contributes to higher particulate matter concentrations. Temperature inversions are common during these cooler months, trapping pollutants near the ground. January and February are often the most challenging months. The wet season, from May to October, generally brings improvements. Monsoon rains effectively wash pollutants from the atmosphere, and increased humidity can suppress dust. However, even during the wet season, localised pollution events can occur due to agricultural burning after the harvest. August and September, while wet, can still experience elevated levels due to this practice. Sensitive groups – children, the elderly, and those with respiratory conditions – should limit strenuous outdoor activity during the dry season and be mindful of agricultural burning periods. Fog, common in the cooler months, can also exacerbate respiratory issues by trapping pollutants. Monitoring wind direction is key; winds from agricultural areas may carry higher pollutant loads.