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Kupang, the capital of Indonesia's East Nusa Tenggara province, occupies a distinctive coastal position on the western tip of Timor Island, overlooking the Savu Sea to the north and the Timor Sea to the south. This strategic location at approximately 10 degrees south latitude places it within the Lesser Sunda Islands archipelago, where the urban core clusters around Kupang Bay—a natural harbor that historically facilitated trade and now supports port activities. The city's terrain transitions from low-lying coastal plains to gently rolling hills inland, with elevations generally below 100 meters, though nearby Mount Fatuleu rises to about 1,000 meters to the east, influencing local wind patterns. Kupang's urban character blends administrative functions with commercial hubs, surrounded by semi-arid savannah and agricultural zones where subsistence farming and livestock rearing dominate, creating a pronounced urban–rural gradient. Proximity to the sea moderates temperatures but also exposes the area to maritime aerosols and occasional sea spray, while the dry, rocky landscape contributes to dust generation, especially during prolonged dry spells. The city's geography, nestled between two bodies of water with limited industrial development compared to Java or Sumatra, generally supports better air quality than Indonesia's megacities, though localized pollution arises from vehicle emissions, biomass burning for cooking, and occasional agricultural residue burning in peri-urban areas. The surrounding landscape, characterized by sparse vegetation and seasonal water scarcity, can amplify particulate matter during windy conditions, making Kupang's air quality sensitive to both natural and anthropogenic factors within its island context.

Kupang's air quality follows a distinct seasonal rhythm shaped by the region's tropical monsoon climate, with two primary seasons: a wet season from November to April and a dry season from May to October. During the wet season, particularly from December to February, frequent rainfall acts as a natural cleanser, washing particulate matter from the atmosphere and leading to generally good air quality, making these months favorable for outdoor activities like hiking in nearby hills or coastal walks. However, occasional heavy downpours can cause temporary spikes in humidity and mold spores, which may affect individuals with respiratory sensitivities. The dry season, especially from August to October, sees pollution levels rise as reduced precipitation allows dust, vehicle emissions, and smoke from agricultural burning to accumulate, with calm winds sometimes trapping pollutants near the surface. During this period, sensitive groups such as children, the elderly, and those with asthma should limit prolonged outdoor exertion, particularly in the late morning when temperatures peak and ozone formation may occur. The transition months of May and November often bring variable conditions, with shifting winds from the southeast monsoon influencing dispersion patterns. Fog is rare, but hazy conditions can develop during extended dry spells, reducing visibility. Overall, Kupang's air quality remains moderate by Indonesian standards, with the wet season offering the cleanest air for residents and visitors to enjoy the city's natural landscapes safely.