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Lākho, a small town in the Gaya district of Bihar, India, occupies a relatively flat section of the Indo-Gangetic Plain. Situated at coordinates 25.4113°N, 86.1792°E, its elevation is modest, contributing to limited natural air dispersion. The surrounding landscape is predominantly agricultural, characterized by intensive farming of rice, wheat, and pulses. This agricultural activity, while vital to the local economy, introduces particulate matter from crop residue burning and fertilizer use. Lākho’s position within the broader Gangetic Plain means it’s susceptible to stagnant air masses, particularly during the winter months. The Phalgu River, a tributary of the Ganges, flows nearby, but its influence on local air quality is limited due to the river’s seasonal flow variations and the prevailing wind patterns. The urban-rural gradient is pronounced; Lākho serves as a market town for surrounding villages, leading to increased vehicular traffic and localized emissions. While not directly within a major industrial belt, the proximity to Gaya, a regional hub with some industrial activity, contributes to background pollution levels. Dust from unpaved roads and construction further degrades air quality, especially during the pre-monsoon season. The town’s compact size and limited green spaces exacerbate the concentration of pollutants.

Lākho experiences a distinct seasonal air quality pattern dictated by the monsoon and post-monsoon cycles. The monsoon season (June-September) generally offers the cleanest air, as rainfall effectively washes away particulate matter and suppresses dust. However, increased humidity can foster mold growth, potentially impacting respiratory health. Post-monsoon (October-November) sees a deterioration in air quality as agricultural burning intensifies following the harvest. This period, coupled with cooler temperatures and the onset of temperature inversions, traps pollutants near the ground. November and December are typically the worst months for air quality, with stagnant air and increased use of solid fuels for heating. The winter months (December-February) are characterized by dense fog, further reducing visibility and exacerbating pollution. Spring (March-May) brings a gradual improvement as temperatures rise and winds pick up, but dust storms are common, temporarily elevating particulate matter levels. Sensitive groups – children, the elderly, and those with respiratory conditions – should limit outdoor activity during the post-monsoon and winter seasons. Avoiding peak traffic hours and using masks when outdoors are recommended precautions. Monitoring local conditions and heeding health advisories is crucial.