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Charaut, nestled within the plains of Bihar, India, at coordinates 26.5322°N, 85.7942°E, presents a unique geographic context influencing its air quality. The city’s terrain is largely flat, typical of the Indo-Gangetic Plain, with a low elevation contributing to the potential for pollutant trapping. Situated approximately 20km south of the Ganges River, the river’s influence on local humidity and wind patterns is significant. Charaut is surrounded by intensely cultivated agricultural land, primarily rice and wheat fields, with seasonal crop residue burning being a major factor. While not directly within a major industrial belt, the broader region experiences industrial activity in nearby Patna and other urban centres, contributing to regional background pollution. The urban-rural gradient is relatively sharp; Charaut itself is a smaller urban centre, but quickly transitions to rural agricultural landscapes. This proximity to agricultural practices, combined with the flat topography and potential for temperature inversions, creates conditions conducive to air pollution accumulation. Dust from agricultural activities and unpaved roads further exacerbates particulate matter concentrations. The city’s location within the densely populated Bihar state also contributes to higher emissions from domestic sources like cooking fuels.

Charaut experiences a distinct seasonal air quality narrative dictated by the monsoon and post-monsoon periods. The summer months (April-June) bring high temperatures and stagnant air, leading to a build-up of particulate matter from dust and local emissions. This is often worsened by sporadic wildfires in surrounding areas. The arrival of the monsoon in July-September offers temporary relief, as rainfall washes pollutants from the atmosphere and increased humidity suppresses dust. However, the monsoon can also bring localised flooding, impacting waste management and potentially releasing pollutants. Post-monsoon (October-November) is arguably the worst period. Cooler temperatures create temperature inversions, trapping pollutants near the ground, while the burning of crop residue after the harvest dramatically increases particulate matter levels. This period sees the highest levels of smog and respiratory issues. Winter (December-February) maintains poor air quality due to continued temperature inversions and the use of solid fuels for heating. For those with respiratory sensitivities, avoiding outdoor activity during October-November is advisable. March-April also pose risks. Maintaining good ventilation indoors and using masks during peak pollution times are crucial health precautions.