Barrackpore cantonment, the oldest cantonment of India is very green indeed and have number of trees with low population density. In this study I had measured the amount of carbon dioxide and particulate matters namely PM 2.5 and PM 10 present in air throughout the years 2019 and 2020. From the experimental results it is evident that lockdown for pandemic and rainfall made a profound effect in air quality for at least seven months of 2020. Particulate matters are serious air pollutants and carcinogenic.

Keywords: Barrackpore Cantonment; Carbon dioxide; Lockdown.