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Bhavnagar occupies a strategic coastal position in Gujarat's Saurashtra peninsula, situated on the Gulf of Khambhat with its urban fabric extending across flat alluvial plains at an average elevation of just 24 meters above sea level. This low-lying topography creates natural drainage challenges while placing the city within a semi-arid landscape where sparse vegetation offers minimal natural filtration for airborne pollutants. The city's geography directly shapes its air quality challenges through multiple pathways: its coastal location exposes it to sea breezes that can disperse pollutants but also brings marine moisture that interacts with industrial emissions, while its position near the Alang ship-breaking yard—one of the world's largest—subjects it to complex pollution plumes containing heavy metals and particulate matter. Bhavnagar functions as an industrial and commercial hub within an agricultural hinterland, creating an urban-rural gradient where crop residue burning from surrounding farms periodically adds to the pollution burden. The city's expansion across flat terrain facilitates urban sprawl with increasing vehicular emissions, while construction activities generate persistent dust clouds that linger in the calm atmospheric conditions characteristic of this coastal plain. Proximity to the Gulf influences local wind patterns that alternately trap pollutants over the city or carry industrial emissions from the nearby industrial belt inland, creating a dynamic but often compromised airshed.

Bhavnagar's air quality follows a distinct seasonal rhythm shaped by its semi-arid climate and coastal influences. During winter (November-February), pollution peaks dramatically as cold, stable air creates temperature inversions that trap pollutants close to the ground, while reduced wind speeds allow industrial emissions, vehicle exhaust, and construction dust to accumulate. This period coincides with increased ship-breaking activity at Alang and festive celebrations adding temporary pollution sources, making these months particularly challenging for respiratory health. Sensitive groups should limit outdoor exposure during morning hours when inversions are strongest. The pre-monsoon summer (March-May) brings extreme heat that accelerates photochemical reactions, creating secondary pollutants, though stronger sea breezes provide some dispersion. The monsoon (June-September) offers the cleanest air as heavy rains wash pollutants from the atmosphere and winds disperse emissions, making this the optimal period for outdoor activities despite high humidity. Post-monsoon (October) sees rapidly deteriorating conditions as rains cease but temperatures remain moderate, allowing pollution to build toward winter peaks. Throughout the year, coastal fog occasionally combines with pollution to create hazardous smog episodes, particularly during winter mornings when vulnerable populations should remain indoors with air filtration where possible.