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Katri, a city nestled in the heart of Madhya Pradesh, India, at coordinates 23.4800°N, 80.4000°E, presents a unique geographic context influencing its air quality. Situated on the Deccan Plateau, the terrain is largely undulating, with a gentle slope towards the south. The city’s elevation, approximately 325 meters above sea level, contributes to localized weather patterns. Katri isn’t directly adjacent to major bodies of water, though the Narmada River flows roughly 60km to the south, offering limited influence on local humidity. The surrounding landscape is predominantly agricultural, characterized by cotton, soybean, and wheat cultivation, with increasing pockets of small-scale industrial activity related to agricultural processing and brick kilns. This mix of agrarian practices and nascent industry is a key factor in air pollution. The urban-rural gradient is relatively sharp; Katri is a significant regional hub, drawing populations from surrounding villages, increasing traffic density and domestic fuel use within the city limits. Dust from agricultural lands, combined with emissions from transport and local industries, creates a complex pollution profile. The city’s position within the Indo-Gangetic Plain’s broader influence also means it can be affected by long-range transport of pollutants from other heavily industrialized regions.

Katri experiences a distinct seasonal air quality narrative. The post-monsoon period (October-November) often sees a build-up of pollutants as cooler temperatures and calmer winds lead to temperature inversions, trapping emissions near the ground. This is exacerbated by increased agricultural burning after the harvest. December and January represent the peak pollution months, with consistently poor air quality due to stagnant air masses and continued burning of biomass for heating. The summer months (April-June) bring some relief, as strong convective winds disperse pollutants, though dust storms originating from the arid regions to the west can temporarily worsen conditions. The monsoon season (July-September) generally offers the cleanest air, as rainfall effectively washes away particulate matter and the winds are strong and consistent. However, increased humidity can also promote secondary pollutant formation. Sensitive groups – children, the elderly, and those with respiratory conditions – should avoid strenuous outdoor activity during October-February. March and the monsoon months are generally more favourable. Monitoring local weather reports and avoiding peak traffic hours are crucial for mitigating exposure.