There is more than one thing involved in air quality. There are plenty of toxins out there. Indoor air quality can be affected by Carbon monoxide, radon, cigarette smoke, whatever toxins are floating around in the smoggy air outside your windows, moisture, mold, formaldehyde off-gassing from your floors. The EPA says “health effects may show up shortly after a single exposure or repeated exposures to a pollutant. These include irritation of the eyes, nose, and throat, headaches, dizziness, and fatigue. Such immediate effects are usually short-term and treatable. Sometimes the treatment is simply eliminating the person’s exposure to the source of the pollution, if it can be identified. Soon after exposure to some indoor air pollutants, symptoms of some diseases such as asthma may show up, be aggrevated or worsened.” You can subscribe to the EPA’s indoor Air Quality Guide at https://www.epa.gov/indoor-air-quality-iaq
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