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Kandahār, Afghanistan's second-largest city, occupies a strategic position in South Asia's arid heartland, situated at 31.6200°N, 65.7158°E within the Kandahar Province. Nestled in the southern part of the country, this historic urban center lies approximately 1,010 meters above sea level on the fertile Arghandab River plain, creating a distinct urban-rural gradient where the city's dense core transitions to agricultural outskirts and then to rugged desert terrain. The city's geography profoundly influences its air quality through multiple mechanisms. Surrounded by the Registan Desert to the southwest and mountainous regions to the northeast, Kandahār exists in a topographical basin that can trap pollutants during atmospheric stagnation. While the Arghandab River provides essential water resources, its seasonal flow patterns contribute to dust generation when dry. The urban area itself represents a concentrated pollution source with vehicle emissions, residential heating, and occasional industrial activity, while the surrounding agricultural zones—particularly during harvest seasons—contribute particulate matter through crop residue burning and soil disturbance. Kandahār's position along major transportation corridors connecting Pakistan, Iran, and Central Asia ensures continuous vehicular traffic, while its semi-arid climate means limited precipitation to cleanse the atmosphere naturally. The city's elevation provides some temperature moderation but doesn't prevent the accumulation of pollutants during calm weather conditions that characterize much of the year in this inland basin.

Kandahār's air quality follows distinct seasonal patterns shaped by its continental desert climate, with pollution levels fluctuating according to meteorological conditions and human activities. During spring (March-May), increasing temperatures and occasional strong winds from the west, known locally as the '120-day wind' or Levar, can disperse pollutants but also lift substantial dust from the surrounding arid landscapes, creating hazardous particulate conditions. Summer (June-August) brings extreme heat with temperatures often exceeding 40°C, which accelerates photochemical reactions that can generate secondary pollutants, though occasional afternoon breezes provide some ventilation. The autumn months (September-November) typically offer the most favorable air quality as temperatures moderate and agricultural burning diminishes, though early morning temperature inversions can trap pollutants near the surface. Winter (December-February) presents the most challenging conditions, with cold temperatures prompting increased residential heating using solid fuels, combined with frequent temperature inversions that create a lid over the valley, trapping smoke and particulate matter for days. Sensitive groups including children, elderly residents, and those with respiratory conditions should limit outdoor exertion during winter mornings and during dust events in spring. The best periods for outdoor activities generally occur in late autumn when temperatures are pleasant and atmospheric mixing is adequate, while the most hazardous conditions typically occur during winter stagnation events and spring dust storms.