Generally speaking, indoor air quality receives less attention than other building performance factors like energy efficiency and temperature control. However, airborne pollutants have a significant impact on human comfort and health. According to the US EPA, we spend more than 90% of our time indoors, and on average, indoor air is 2 to 5 times more polluted than outside air.

The concentration of air contaminants must be kept under control to improve indoor air quality. There are three different ways to do this, and combining them yields the greatest outcomes:

• Reducing indoor air pollution sources as much as possible.

• Supplying a steady flow of clean outdoor air and purifying stale inside air of contaminants.

• Direct removal of air contaminants. Filters and air purifiers are a couple of other ways to achieve this.

What Are the Primary Sources of Air Pollution?

The general public is aware of two sources of air pollution, including car exhaust and tobacco smoke. Other sources of pollution, however, are less evident. For instance, dangerous molecules known as volatile organic compounds, or VOCs, are included in the majority of air fresheners and cleaning supplies. Since these goods' aroma is seen as pleasant, air pollution is not typically linked to them.

VOCs are also produced by construction materials, particularly in newly constructed structures. A high level of VOCs in the air is the reason why the inside of a building or car "smells like new."

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