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Gwadar, a strategically vital port city in Balochistan, Pakistan, occupies a unique and challenging geographic position. Situated on the Arabian Sea coast, its coordinates (25.1264° N, 62.3225° E) place it within a semi-arid subtropical climate zone. The city’s terrain is predominantly flat, a coastal plain gradually rising towards the surrounding rugged mountains of the Makran Range to the north. This proximity to the mountains creates a natural barrier, potentially trapping pollutants under certain meteorological conditions. Gwadar’s location at the head of Gwadar Bay provides access to deep-water shipping lanes, a key factor in its development as part of the China-Pakistan Economic Corridor (CPEC). The surrounding landscape is characterized by sparse vegetation, primarily scrubland and desert, with limited agricultural activity in the immediate vicinity. Further inland, the landscape transitions to more extensive arid plains. The urban–rural gradient is relatively sharp, with a rapid shift from the developing urban core to sparsely populated rural areas. The ongoing port development and associated construction activities, alongside the nascent industrial zones, are increasingly influencing the local environment. The prevailing winds, often originating from the Arabian Sea, can carry both marine aerosols and pollutants from industrial sources, impacting air quality. The city’s rapid growth, driven by CPEC investments, is placing increasing pressure on infrastructure and environmental management, making air quality a growing concern.

Gwadar’s air quality exhibits a distinct seasonal pattern dictated by its subtropical climate and monsoon influences. The monsoon season, typically from June to September, brings increased humidity and rainfall, generally leading to a temporary improvement in air quality as pollutants are washed from the atmosphere. However, the associated increased construction activity and potential for flooding can introduce new sources of particulate matter. The preceding months (March-May) often experience a build-up of pollutants due to stagnant air and rising temperatures, creating conditions conducive to temperature inversions, particularly in the evenings. These inversions trap pollutants close to the ground, exacerbating respiratory issues. The winter months (November-February) are characterized by cooler temperatures and occasional fog, which can also contribute to pollutant accumulation, reducing visibility and increasing the concentration of fine particulate matter. During these months, the relatively calm winds offer little dispersion. The dry season (October-March) generally sees lower rainfall, but the lack of cleansing precipitation allows pollutants to persist. Sensitive groups, including children, the elderly, and individuals with pre-existing respiratory conditions, should exercise caution during periods of stagnant air and fog, particularly in the late afternoon and evening. Outdoor activities are generally more favourable during the monsoon months, although construction-related dust should still be considered. Careful monitoring of local conditions and adherence to public health advisories are crucial for mitigating potential health risks.