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CO is a colorless, odorless gas produced by burning fossil fuels. Exposure can cause headaches, dizziness, and even death at high levels.

Mold grows in damp conditions and can produce allergens, irritants, and potentially toxic substances. Exposure can cause respiratory issues and allergic reactions.

CO2 at very high levels can cause headaches, dizziness, restlessness, and breathing difficulties. It is an indicator of proper ventilation.

Ozone is a molecule composed of three oxygen atoms. Indoor ozone can cause chest pain, coughing, throat irritation, and airway inflammation.

Radon is a radioactive gas that comes from the natural decay of uranium in soil. Linked to lung cancer, especially in smokers.

Indoor temperature can affect comfort and health. Extreme temperatures can lead to heat stress or hypothermia.

Lead particles result from lead-based paint or contaminated dust. Exposure can affect brain development and cause behavioral issues, especially in children.

PM refers to the mixture of solid particles and liquid droplets in the air. Can cause respiratory issues and aggravate preexisting lung diseases.

Formaldehyde is a colorless gas with a pungent smell, used in building materials and household products. It can cause irritation and is a known carcinogen.

Biological contaminants include molds, bacteria, viruses, pollen, and dust mites. Can cause respiratory issues, allergies, and spread diseases.

Pesticides used in homes can linger in the air and surfaces. Overexposure can lead to neurological problems and increased cancer risk.

Asbestos is a naturally occurring mineral fiber that when inhaled can lead to lung diseases like asbestosis, mesothelioma, and lung cancer.

VOCs are emitted as gases from certain solids or liquids and include a variety of chemicals. Exposure can cause eye, nose, and throat irritation, headaches, and organ damage.

Indoor humidity levels can affect comfort, health, and mold growth. High humidity can lead to mold formation and health issues like asthma.