Climate change is the change of temperature and weather pattern in long terms caused by the accumulation of greenhouse emission in the atmosphere. Those emissions act like a blanket covering earth, trapping heat and causing the increase of earth’s temperature. The emissions of greenhouse gases causing climate change are CO2, O3, N2O, CH3, et cetera. The existence of these gases have to be observed periodically for monitoring and controlling purposes. These days, remote sensing is capable of doing that. Sentinel-5P imagery exists as an imagery that can observe gas concentration within the earth’s atmosphere. This research is aimed to observe CO and O3 gas, which cause climate change, using Sentinel-5P satellite imagery using Google Earth Engine (GEE) periodically. GEE is a platform allowing its users to access and process data freely. The result of this research shows that there is a change in CO and O3 concentration throughout January to November 2021. The highest concentration for CO was in October, and the lowest was in July. Meanwhile, the highest concentration for O3 was in October, and the lowest was in June. Based on the research done, Sentinel-5P satellite imagery succeeded in monitoring CO and O3 concentration periodically every month.