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Moradabad, situated in the fertile plains of western Uttar Pradesh, occupies a strategic position in the Ganges-Yamuna Doab region at an elevation of approximately 198 meters above sea level. The city lies along the Ramganga River, a tributary of the Ganges, which flows about 10 kilometers to the north, though this proximity provides limited air cleansing effects. Moradabad's urban character is defined by its dense, unplanned growth as a major industrial hub, particularly renowned as India's 'Brass City' with thousands of small-scale metalworking units concentrated in its core. The surrounding landscape transitions rapidly from urban sprawl to intensive agricultural zones, creating a sharp urban-rural gradient where crop residue burning from neighboring farmlands directly impacts city air. Located within the National Capital Region's industrial belt, Moradabad sits approximately 150 kilometers east of Delhi, placing it within a broader pollution corridor where regional transport of pollutants occurs. The flat terrain of the Indo-Gangetic Plain, combined with the city's position in a basin-like depression, creates poor natural ventilation that traps pollutants from local brass industry emissions, vehicle exhaust, and construction dust. This geographic setting, devoid of significant topographic barriers to disperse pollution, makes Moradabad particularly vulnerable to severe air quality degradation, especially during winter months when meteorological conditions worsen.

Moradabad's air quality follows a distinct seasonal pattern shaped by its humid subtropical climate and regional agricultural practices. During winter (October-January), pollution peaks dramatically as multiple factors converge: post-monsoon crop residue burning in surrounding farmlands releases massive particulate matter, while calm winds, dense fog, and frequent temperature inversions trap brass industry emissions and vehicle exhaust close to the ground. These months feature the worst air quality, with sensitive groups advised to limit outdoor exposure and use N95 masks. Spring (February-March) brings gradual improvement as temperatures rise and winds increase, though lingering industrial pollution and occasional dust storms maintain moderate pollution levels. The summer monsoon (June-September) offers the cleanest air as heavy rains wash away pollutants and strong southwesterly winds disperse emissions, making this the optimal period for outdoor activities. However, extreme heat in May-June can occasionally elevate ozone levels. Autumn (September-October) marks a rapid deterioration as monsoon withdrawal coincides with renewed agricultural burning and festive fireworks. Throughout the year, vulnerable populations including children, elderly, and those with respiratory conditions should monitor daily air quality forecasts, with particular caution during winter inversion episodes when pollution concentrates at ground level.