There are a whole lot of gases that can be pollutants in your indoor air. Gases are individual atoms or molecules that are on the order of 0.0001 microns. Some of them also carry viruses and bacteria that spread disease. These particles are one of the worst indoor air pollutants. Smaller particles, especially those that are 2.5 microns and smaller (PM2.5), can make it deep into your lungs and from there into the blood stream. Larger particles don’t make it past the upper respiratory system. Once we get down to 10 microns and less, the particles not only float in the air longer but also can penetrate deeper into your body.
A lot of these settle out of the air because of their weight. They include the things you can see floating around in the air when the lighting conditions are right as well as things that are not quite visible to the naked eye. Larger particles are 100 microns or so in size. Particles come in a wide range of sizes and come from different sources. We can divide the bad stuff in your indoor air into two categories: particles and gases. Before we get into her take on the subject, though, let’s define what we’re talking about here. She’s been immersed in this field for about six years and has been one of the most vocal opponents of electronic air cleaners, especially those that use ionization. Marwa Zaatari, a mechanical engineer and IAQ consultant who is on ASHRAE’s Epidemic Task Force, and she gave me the lowdown on electronic air cleaners. Unfortunately, it has also brought a huge amount of money to companies selling questionable electronic “air cleaners.” And that in turn has brought a huge amount of pushback from the IAQ research community.
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The pandemic has brought a huge amount of attention to indoor air quality, even without full acceptance of the aerosol transmission of COVID-19.
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