This paper aimed to review the current status of air quality research. Papers from 2014 to 2021 were selected from Google Scholar and have been reviewed in different sections. The basic cause for research in air quality is its effect on human health and the environment. Mainly six variables are measured to evaluate whether the air quality at a particular site is good or bad according to the standards set by any reference agencies. For measurement, stationary air quality monitoring stations are used. However, mobile or low-cost sensor platforms are becoming popular now. A network of sensors in an area can provide sufficiently reliable measurements. Economic development variables of a country may be related to the air quality there. More research seems to have been done in the case of particulate matter, as its effect on health is direct. The effect of vegetation in stopping particulate matter from spreading leads to considering integrated crop-livestock systems to reduce pollution. On the other hand, the adverse effects of biomass burning on air quality are well-researched. The review also found that a lot of research has been done on the impact of the Covid-19 pandemic on air pollution. The pandemic has helped to reduce air pollution significantly.

Keywords: Air quality, pollution, covid-19, indoor, review