Uploaded October 2025 | Updated September 2026, 1 week ago
In 2025, the U.S. Environmental Protection Agency (EPA) published a new factsheet titled What is Indoor Air Quality? It outlines key sources and factors that affect indoor air and offers practical steps to help improve it.
Let’s take a closer look.
Protect Yourself and Your Family
Indoor air quality, or IAQ, refers to the condition of the air inside buildings and how it impacts the health, comfort, and productivity of the people who live and work there.
Why Does Indoor Air Quality Matter?
• Most of us spend about 90% of our time indoors
• Indoor air can be several times more polluted than the air outside
• Poor air quality can lead to health issues, reduced productivity, and increased maintenance and operational costs in buildings
What Affects Indoor Air Quality?
A variety of sources and conditions can influence indoor air, including:
• The behavior and activities of people indoors
• Consumer products, building materials, and furnishings
• Gases from the ground, such as radon
• Indoor temperature, humidity, and moisture levels
• The condition of building systems like HVAC and plumbing
• Outdoor air that enters the building
• The building’s size, design, and age
How Can You Improve Indoor Air Quality?
Here are three key strategies:
1. Source Control – Identify and reduce indoor pollution at its source
2. Ventilation – Increase the flow of fresh air to dilute and remove indoor pollutants
3. Filtration and Air Cleaning – Use effective filters and air cleaners to capture and reduce airborne contaminants.
This EPA factsheet offers just a snapshot of what you can do to make indoor environments healthier and safer. To learn more about indoor air quality, or other important environmental, health, and safety issues, please visit the websites displayed below.
Clark Seif Clark csceng.com
EMSL Analytical, Inc. emsl.com
LA Testing latesting.com
Zimmetry Environmental zimmetry.com
Healthy Indoors Magazine healthyindoors.com
In 2025, the U.S. Environmental Protection Agency (EPA) published a new factsheet titled What is Indoor Air Quality? It outlines key sources and factors that affect indoor air and offers practical steps to help improve it.
Let’s take a closer look.
Protect Yourself and Your Family
Indoor air quality, or IAQ, refers to the condition of the air inside buildings and how it impacts the health, comfort, and productivity of the people who live and work there.
Why Does Indoor Air Quality Matter?
• Most of us spend about 90% of our time indoors
• Indoor air can be several times more polluted than the air outside
• Poor air quality can lead to health issues, reduced productivity, and increased maintenance and operational costs in buildings
What Affects Indoor Air Quality?
A variety of sources and conditions can influence indoor air, including:
• The behavior and activities of people indoors
• Consumer products, building materials, and furnishings
• Gases from the ground, such as radon
• Indoor temperature, humidity, and moisture levels
• The condition of building systems like HVAC and plumbing
• Outdoor air that enters the building
• The building’s size, design, and age
How Can You Improve Indoor Air Quality?
Here are three key strategies:
1. Source Control – Identify and reduce indoor pollution at its source
2. Ventilation – Increase the flow of fresh air to dilute and remove indoor pollutants
3. Filtration and Air Cleaning – Use effective filters and air cleaners to capture and reduce airborne contaminants.
This EPA factsheet offers just a snapshot of what you can do to make indoor environments healthier and safer. To learn more about indoor air quality, or other important environmental, health, and safety issues, please visit the websites displayed below.
Clark Seif Clark csceng.com
EMSL Analytical, Inc. emsl.com
LA Testing latesting.com
Zimmetry Environmental zimmetry.com
Healthy Indoors Magazine healthyindoors.com
