Indoor vs Outdoor air, which is more harmful?

In fact with breakthrough infections showing up for some, even the vaccinated do not feel completely safe from a possible assault of the virus. The finding that the virus can be airborne is scary enough, research also shows that the transmission of the coronavirus is higher indoors than outdoors. This means that even if you don't step out and think that the virus can't get to you because you are ensconced safely and comfortably indoors, the bad news is that you can still get infected.

So, what should you do to keep the virus at bay while being confined indoors? While taking other precautions, keeping the indoor air sanitized, and constantly so, is one big answer to this.

Unlike the earlier dominant belief that only respiratory droplets could spread infection, it has been established now that the tiny aerosols in the air can carry the coronavirus. These aerosols which are smaller and lighter than respiratory droplets can not only stay longer in the air but also carry the virus farther and for a longer time. The assumption that only by making contact with a contaminated surface one can get the virus, is no more valid.

We must remember that a lot of our daily natural and basic activities are conducted in our indoor spaces many of which involve active and oral expulsion of particles. From talking to shouting to sneezing and coughing to even singing, every one of these acts and others creates aerosols in the air which whether we like it not, continue to be exchanged with the others. In fact, many of these activities create more aerosols than even breathing. So, if we do not repeatedly ventilate the room and purify the air within, we can always be susceptible to be infected by others. Even if a house has no Covid patient, the risk of the virus being transmitted through the air from the neighbors or temporary staff can never be ruled out.

As opposed to outdoor air which has natural circulation, unfortunately, indoor air doesn't have the same advantage. In India, the outdoor air itself isn't healthy enough for the human respiratory and health system due to the high amount of PM2.5, PM1.0, and other pollutants. So, without timely ventilation and purification, the chances of indoor air getting stale and unhygienic and thereby becoming more conducive to the 'designs' of coronavirus become very high. Add to this, there are recent studies that prove the possibility of PM2.5 particles being potential carriers of coronavirus, carrying them too much larger distances in the air. The high temperature and humidity which often characterizes our tropical climate add to the woes.