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Charsadda, nestled in the fertile Peshawar Valley of Khyber Pakhtunkhwa, Pakistan, occupies a strategically important location at 34.15°N, 71.73°E. The city’s geography is dominated by the gently sloping alluvial plains formed by the Swat River and its tributaries, creating a landscape ideal for agriculture. Situated approximately 30 kilometers northwest of Peshawar, Charsadda sits within a transitional zone between the rugged Hindu Kush mountains to the north and the relatively flat Indus Plain to the south. This position influences regional weather patterns and, consequently, air quality. The surrounding landscape is predominantly agricultural, with extensive fields of wheat, maize, and sugarcane stretching across the valley floor. This agricultural activity, while vital to the local economy, contributes to seasonal particulate matter through crop burning and fertilizer use. The urban–rural gradient around Charsadda is gradual, with smaller villages and agricultural holdings blending seamlessly into the city’s periphery. Elevation plays a role; Charsadda sits at a modest elevation of around 287 meters (942 feet) above sea level, which can exacerbate temperature inversions during cooler months, trapping pollutants closer to the ground. While not directly adjacent to a major body of water, the proximity of the Swat River moderates temperatures to some extent. The city’s location near Peshawar, a significant industrial and transportation hub, exposes it to transboundary pollution and vehicular emissions, further complicating its air quality profile.

Charsadda’s air quality experiences a distinct seasonal cycle heavily influenced by regional meteorology and agricultural practices. The winter months (November to February) typically see the poorest air quality. Cold temperatures frequently lead to temperature inversions, where a layer of warm air traps cooler air and pollutants near the ground, resulting in stagnant conditions. Fog, common during this period, further reduces visibility and concentrates particulate matter. Agricultural burning, a traditional practice for clearing fields after harvest, significantly contributes to elevated levels of smoke and pollutants during these months. Spring (March to May) brings a gradual improvement as temperatures rise and winds increase, dispersing pollutants. However, dust storms originating from the surrounding arid regions can still impact air quality. The monsoon season (June to September) offers a period of relative relief, with rainfall washing away pollutants and increased wind speeds aiding in dispersion. However, heavy rainfall can also lead to flooding and associated issues. Autumn (October) sees a return to slightly poorer conditions as temperatures cool and the agricultural cycle prepares for the next harvest, with the potential for renewed burning. Sensitive groups, including children, the elderly, and individuals with respiratory conditions, should exercise caution during the winter months, limiting outdoor activity during periods of heavy fog or visible smoke. During the monsoon, while generally cleaner, be mindful of potential waterborne illnesses. Throughout the year, maintaining awareness of local conditions and avoiding prolonged exposure to areas with visible pollution is advisable.