Covid-19 is a disease caused by a human coronavirus, SARS-CoV-19, which is a member of the coronaviridae family of viruses. It's size would be on the order of a nanometer or two, depending on structure. What is important to remember is the size of viruses that have proven to be harmful or deadly to humans. These all share typical characteristics. Particle Size of Gases While particulates can be tiny in size, gases are even smaller. ... tobacco smoke, and more. “COVID 19 virus particle size is 125 nanometers (0.125 microns); the range is 0.06 microns to .14 microns,” the post said. A virus, while tiny, is still thousands and thousands of atom. “The N95 mask filters down to 0.3 microns. Smaller dust particles can be hazardous for humans. So the coronavirus is about 0.12 microns in diameter and N95 (masks) protect down to 0.1 microns, with 95% efficiency, which is where it gets its name. Inhalable Dust As viruses go the SARS-CoV-2 virus is quite large and much, much larger than an oxygen molecule. In many jurisdictions dust fractions at specified particle sizes in working environments are required to be measured. Compare that to bacteria’s 1,000-nm size. includes viruses, small bacteria, metallurgical fumes, soot, oil smoke, tobacco smoke, clay, and fumes; Hazardous Dust Particles. The idea behind an N95 mask is it has a filtering ability down to, and actually below, the size of SARS-CoV-2, the virus that causes COVID-19. The purpose of this webpage is to provide Air Resource Advisors and other environmental health professionals with key messages about wildfire smoke and COVID-19. Hope this helps a little when it comes to understanding the size of these particles. First of all, we need to know that any virus is very small in size, normal surgical masks have pore approx 0.3-10 microns, and viruses are 0.004 to 0.1 microns in size. A typical ester would have maybe 20-80 atoms. Note the size range of viruses in this chart… .005 – 0.3. The .005 is much smaller than many water filters claim to remove! For the record, that's five one-thousandths of a micron! It also provides resources that can be given to communities affected by wildfire smoke during community spread of SARS-CoV-2, the virus that causes COVID-19. A coronavirus virion (particle) is spherical, averaging around 125 nanometers in diameter. Accurate measurement of cigarette smoke particle size distribution is important for estimation of lung deposition. 1 Micron = 1000 NanoMeters. It’s a grape compared to a grapefruit. Viruses: .005 to .3 Microns Virus particles are extremely small, usually no more that .3 microns. Most prior investigators have reported a mass median diameter (MMD) in the size range of 0.3 to 0.5 micron, with a small geometric standard deviation (GSD), indicating few ultrafine (less than 0.1 micron) particles. 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