Kampala, the capital city of Uganda is one of the notable and busiest cities in the East African territory. In recent days it is observed that the air pollution in Kampala city is rapidly increasing due to the hike of vehicles running in fossil fuels, industrialization and the use of biomass fuel for domestic purposes. This article explicit the Air Quality Index (AQI) measured in a key region (US embassy, Kampala) during the COVID-19 induced lockdown period. The data has been compared with the same period of the previous year. Promising and notable observations were made in terms of AQI of Kampala city.