Introduction COVID-19 is a pandemic that affected humans ’ lives and activities through the year 2020 in a way that was not witnessed in recent years . Many governments declared a complete lockdown as a try to stop the transmission of the disease . This lockdown resulted in a good recovery in environmental health, where air pollutants levels dramatically decreased . Theory There are two relations between air pollution and COVID-19, one is before the disease spread, and the other is after . Before the disease spread, many areas had high levels of contaminants in the air due to industrial activities, transportation, and human density . These areas had the highest infection rates and death cases . This could be attributed to two reasons, the aerosol could help to spread the virus at a higher rate, and air pollutants could negatively affect peoples ’ lungs, which assisted the virus in attacking the patients brutally . Results After the disease spread, the lockdown that was applied in the major industrial countries led to a decrease in the pollutants levels and an increase in the ozone level in the air . This lockdown improved the air quality worldwide to a level that all political conferences and agreements could not reach . In this review, we are showing the impact of COVID-19 on air pollutants in different countries . Summary This paper provides information about pollutants' influence on human and environmental health that other researchers obtained in different areas of the globe before and after the pandemic . This could give ideas about the impact of humans on the environment and the possible ways of recovering the environment's health.