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Loni occupies a strategic position in the National Capital Region of India, situated approximately 20 kilometres northeast of Delhi along the Delhi-Ghaziabad corridor. This urban settlement lies within the fertile Indo-Gangetic Plain at an elevation of around 213 metres above sea level, characterized by flat alluvial terrain with minimal topographical relief. The city's proximity to the Yamuna River, flowing just 5 kilometres to the west, provides both agricultural benefits and occasional flood risks during monsoon seasons. Loni exists within a distinct urban-rural gradient, transitioning from dense urban development in its core to agricultural fields and brick kiln operations in peripheral areas. This location places Loni directly within the Delhi Metropolitan Area's industrial belt, surrounded by manufacturing zones and transportation arteries that funnel pollution across regional boundaries. The city's geography specifically exacerbates air quality challenges through its position downwind of Delhi's massive pollution plume, with the flat terrain offering no natural barriers to pollutant dispersion. Surrounding agricultural zones contribute to post-harvest burning episodes, while the urban heat island effect interacts with regional meteorological patterns to trap pollutants. Loni's development as a satellite city has created a patchwork of industrial, residential, and agricultural land uses that collectively generate complex pollution mixtures, with road dust from unpaved areas combining with vehicle emissions from the heavily trafficked Delhi-Ghaziabad highway that bisects the settlement.

Loni's air quality follows a dramatic seasonal cycle dictated by the humid subtropical climate and regional meteorological patterns. During winter months from October through January, pollution reaches hazardous levels as cold temperatures combine with dense fog and frequent temperature inversions that trap pollutants near the surface. These meteorological conditions, coupled with increased biomass burning for heating and post-harvest agricultural residue burning in surrounding fields, create a toxic haze that persists for days. Sensitive groups including children, elderly residents, and those with respiratory conditions should minimize outdoor exposure during these peak months, particularly during morning hours when fog and inversion layers are most intense. The pre-monsoon summer months from March to June bring extreme heat that accelerates photochemical reactions, transforming primary pollutants into secondary aerosols, though occasional dust storms provide temporary ventilation. The monsoon season from July to September offers the cleanest air as heavy rains wash pollutants from the atmosphere and strong southwesterly winds provide effective dispersion. However, high humidity during this period can exacerbate respiratory distress for some individuals. Post-monsoon months see rapid deterioration as winds shift to northwesterly directions, transporting additional pollution from Punjab's agricultural burning while local meteorological conditions become increasingly stagnant. Residents should plan outdoor activities for monsoon months when air quality is most favourable, while implementing protective measures like air purifiers and N95 masks during the hazardous winter period.