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Lagunia Surajkanth, nestled within the state of Bihar, India (coordinates 25.8304°N, 85.7887°E), is a small urban centre with a population of approximately 14,457. The city occupies a relatively flat portion of the Indo-Gangetic Plain, a vast alluvial plain formed by the Ganges and its tributaries. This terrain, while conducive to agriculture, also presents challenges for air quality dispersion. Lagunia Surajkanth’s location is characterized by fertile agricultural lands, primarily dedicated to rice and wheat cultivation, surrounding the urban core. The proximity to the Ganges River, while providing a vital water source, can contribute to localized humidity and potential fog formation, impacting pollutant concentrations. The urban-rural gradient is sharp; the city is a concentrated pocket of activity within a predominantly agrarian landscape. While not directly within a major industrial belt, regional brick kilns and small-scale industrial activity contribute to particulate matter emissions. The lack of significant topographical features – hills or mountains – hinders natural ventilation, trapping pollutants during periods of calm weather. Dust from agricultural practices and unpaved roads further exacerbates the situation, particularly during the dry season. The city’s position within the densely populated Bihar plain means it’s susceptible to regional pollution transport.

Lagunia Surajkanth experiences a distinct seasonal air quality pattern dictated by the monsoon and post-monsoon weather systems. The monsoon season (June-September) generally offers the cleanest air, as heavy rainfall effectively washes away particulate matter and suppresses dust. However, increased humidity can also promote the formation of secondary pollutants. October-November sees a deterioration in air quality as the monsoon retreats, and temperatures drop, leading to temperature inversions that trap pollutants near the ground. This period coincides with post-harvest crop residue burning, a significant source of smoke and particulate matter. Winter (December-February) is typically the worst period for air quality, with stagnant air, low temperatures, and increased reliance on biomass burning for heating. Fog further exacerbates the problem, reducing visibility and trapping pollutants. March-May brings rising temperatures and drier conditions, leading to increased dust and potential for localized fires. Sensitive groups – children, the elderly, and those with respiratory conditions – should limit outdoor activity during the winter and post-monsoon months. Avoiding peak hours near roadways and agricultural areas is also advisable. The monsoon months offer the most favourable conditions for outdoor activity, but awareness of humidity-related issues is important.