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Today, air pollution around the world, specially in towns and cities harms our health and contributes a number of global premature deaths. Breathing quality air is critical for good health, even breathing indoors.
Most poeple spend their time indoors either in the home, office or other types of buildings where gas, chemical and other pollutants can cause many diseases. Serious pollutants can cause certain types of cancers and other long-term health complications.
Studies from the Environmental Protection Agency (EPA) have shown that indoor pollutant levels are 2-5 times higher than outdoor pollutants. Even sometimes it can be 100 times higher than outdoor pollutants.
Atmospheric particulate matter (PM) , also know as particulates, can be found indoors and can affect the health of occupants. These matters are larger than gaseous matters but still to small to be noticed, yet they pose various health hazards to people.
Droplets are particles of mucus or saliva that are larger than airbones and aerosols. Droplets transmission usually occurs when saliva containing this virus comes in contact with the eyes, nose or mouth of another person.
The first study published in the journal of the American Medical Association, as reported by the Medical Daily, states that respiratory droplets exhaled when a person exhales are greater than or equal to 5 microns (µm) in size.
Droplet sizes are measured in microns. A micron is 1/1000 millimeter, or about 1/25,000 of an inch. For perspective, a human hair is about 100 microns in diameter. Spray droplets smaller than 150 microns tend to be the most prone to drift. These small droplets fall more slowly than large droplets. They do not have enough weight to overcome air resistance and are likely to float in wind currents.
