The microclimate within the subterranean subway has drawn attention from the general public due to its poor air quality. In recent decades, rapid construction of subway and metro systems has occurred all over the world, especially in response to the growing need for environmentally friendly transportation and sustainable development. Major cities have seen a steady increase in the number of metro passengers in recent years. In certain places, the metro system has supplanted other forms of public transportation. Even though passengers are only in metros for 30–40 minutes at a time, hazardous air pollutants created by various interior metro system components as well as air pollutants conveyed by ventilation supply air are significant sources that might lead to harmful human exposure. Various ecological wellbeing studies recommend that travelers' openness to different air contaminations on metro trains might adversely affect their wellbeing. A wellbeing risk evaluation, contamination fixation levels, synthetic species, and related sources are a couple of the critical discoveries from the writing on indoor air quality in metro districts that are featured in this examination. We painstakingly investigated in excess of 160 significant examinations from in excess of 20 distinct countries. On the whole, there were near 2000 different estimating trips. Airborne microorganisms, carbonyls, sweet-smelling hydrocarbons, and particulate matter have all been distinguished as significant air contaminations inside the metro framework. Future investigations might zero in on creating progressed air filtration frameworks to further develop the air quality at metro stations as well as laying out the drawn out wellbeing effects of openness to air contaminations other than PM.