CADR testing for smoke is only for particle sizes 0.09–1.0 µm. It does not test for molecular filtration of scents, odors or VOCs. Those molecules are measured in Angstroms [0.09–1.0 µm = 900-10,000 Angstroms]. That means the smallest HEPA filter gaps CADR tested are 900 times larger than molecules of scents, odors or VOCs. Many of those molecules, especially of VOCs, are harmful to health.
CADR stands for Clean Air Delivery Rate. Wikipedia
“The CADR numbers reflect particulate matter remaining in the air, which has not been captured by the filter or other technology. Some low-efficiency filters employ ionization, which attaches a weak electrostatic charge to particulate matter, which can cause several smaller particles to group together resulting in a lower particle measurement count. Ionization can also cause particulate matter to attach to surfaces such as walls, and flooring, resulting in lower particulate counts in the air, but without having particulate matter permanently removed from the air.”
“The defined particle size ranges are 0.09–1.0 µm for smoke, 0.5–3 µm for dust, and 5–11 µm for pollen.”
Compare competitive air purifiers to OutAirOdor units
Air purifiers that sell for less than $400.00 have low CADR ratings for smoke, which is particulate. The lower their price, the lower their rating. None selling for less than $200.00 take out more than 50% of smoke particles.
Since CADR is not a test for molecular pollution, none have a rating for filtration of scents, odors or VOCs. So, their marketers tend to lead by stating they meet the impressive looking HEPA particle standard (99.97% of particles that have a size greater than or equal to 0.3 µm). Molecules are times smaller than 0.3 microns, they are measured in Å-angstroms. An angstrom is one ten-billionth of a meter [3,000 Å=0.3 microns]. Molecules easily pass through the HEPA filter gaps 3,000 times larger.
OutAirOdor filters are infused with millions of minuscule carbon granules measured in Å-angstroms. Through adsorption, adverse molecules cling to the surface of those granules. This process removes odors and chemical irritants caused by cooking, smoking, other household sources and VOCs. The filters are also carefully engineered to absorb troublesome particles: pollens, pet dander, dust mite matter, mold & mildew spores, many bacteria & viruses. These combined qualities of adsorption and absorption make in-home air clean and attractive.