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Diu, a coastal city within the union territory of Dādra and Nagar Haveli and Damān and Diu, occupies a unique geographic position on the southeastern coast of Gujarat, India. Situated at approximately 20.7158° N, 70.9858° E, the island is characterized by a relatively flat terrain, averaging around 30 meters above sea level. Its location on a small island, separated from the mainland by the Gulf of Cambay, significantly influences its air quality dynamics. The surrounding landscape is dominated by the Arabian Sea, providing a constant source of sea breezes that generally contribute to air dispersion. However, this benefit is tempered by the island’s limited land area, which restricts the effective dilution of pollutants. While Diu lacks extensive industrial belts within its immediate vicinity, it is situated within a region experiencing increasing agricultural activity, particularly in the mainland areas across the Gulf. This agricultural activity, including fertilizer use and seasonal burning, can contribute to transboundary pollution events. The urban–rural gradient is relatively sharp, with the city center exhibiting higher population density and vehicular traffic compared to the surrounding rural areas, which are largely characterized by fishing villages and agricultural land. The island’s geology, primarily consisting of basaltic rock, doesn't significantly impact air quality directly, but influences drainage patterns and potential dust generation during construction activities. The prevailing winds, generally southwesterly, play a crucial role in transporting pollutants either offshore or from mainland sources, impacting Diu’s air quality profile.

Diu’s tropical climate dictates a distinct wet and dry season pattern, profoundly influencing its air quality. The dry season, typically spanning from October to May, is characterized by lower humidity and increased sunshine, often leading to stagnant air conditions. Temperature inversions, where cooler air is trapped beneath a layer of warmer air, are more frequent during these months, hindering vertical mixing and trapping pollutants near the ground. Agricultural burning in surrounding regions during the post-harvest period (November-December) can significantly exacerbate particulate matter levels. The monsoon season, from June to September, brings relief through increased rainfall and stronger winds, effectively flushing out pollutants and improving air quality. However, the monsoon also introduces moisture, which can react with certain pollutants to form secondary aerosols. Fog, common during the cooler months (December-January), further reduces visibility and traps pollutants close to the surface. During the summer months (March-May), high temperatures can contribute to the formation of ground-level ozone, although this is generally less pronounced than in larger, more industrialized cities. Sensitive groups, including children, the elderly, and individuals with respiratory conditions, should exercise caution during the dry season, particularly during periods of agricultural burning or fog. Outdoor activities are generally more favorable during the monsoon months, although heavy rainfall can still pose challenges. The transition periods between seasons often see fluctuating air quality, requiring vigilance and awareness of local conditions.