A Comprehensive Guide to Common Indoor Air Pollutants and Their Origins

HVAC services in Littleton, CO

Indoor air pollutants are substances found in the air inside buildings and homes and can adversely affect human health. Understanding these common pollutants and their sources is crucial for maintaining a healthy indoor environment.

Particulate Matter (PM)

Particulate matter refers to tiny solid particles and liquid droplets suspended in the air. These particles can be of various sizes, and the smaller ones, such as PM2.5 and PM10, can penetrate deep into the respiratory system, causing respiratory issues. Common sources of particulate matter indoors include cooking activities, tobacco smoke, dust mites, pet dander, and outdoor air pollution that infiltrates buildings.

Volatile Organic Compounds (VOCs)

VOCs are organic chemicals that can vaporize and easily become gases. They are emitted from various products and materials, including paints, cleaning agents, furniture, carpets, and air fresheners. VOCs can contribute to indoor air pollution and lead to headaches, dizziness, and irritation of the nose, eyes, and throat. Some VOCs can even have long-term health effects, including liver and central nervous system damage.

Carbon Monoxide (CO)

Carbon monoxide is a colorless, odorless gas that can be lethal in high concentrations. It is produced by incomplete combustion of fossil fuels in gas stoves, heaters, and fireplaces. CO binds to hemoglobin in the blood, reducing the oxygen-carrying capacity, leading to symptoms like headaches, dizziness, and even death in extreme cases.


Radon is a radioactive gas that can seep into homes from the ground through cracks in the foundation. It is the second leading cause of lung cancer after smoking and can accumulate to dangerous levels in poorly ventilated spaces. Radon testing is essential to identify its presence and mitigate its effects.

Mold and Mildew

Moisture buildup in indoor environments can lead to mold and mildew growth. These microscopic fungi release spores into the air, which, when inhaled, can trigger allergies and respiratory problems. Common sources of moisture include leaks, high humidity, and water damage.

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