Radon Testing and Radon Mitigation Services in O’Fallon, IL

Radon Testing and Radon Mitigation Experts Serving O’Fallon, IL & Surrounding Areas

Located in St. Clair County, O’Fallon, IL, is a thriving community known for its excellent schools, rich history, and vibrant local economy. However, like many parts of Illinois, O’Fallon faces challenges related to indoor air quality, particularly concerning radon exposure. At Air Sense Environmental, we specialize in radon testing, mitigation, and indoor air quality solutions to ensure that homes and businesses in O’Fallon maintain a safe and healthy environment.

Radon in O’Fallon, IL: Understanding the Risk

Radon is a naturally occurring, colorless, and odorless radioactive gas that poses significant health risks, including lung cancer, upon prolonged exposure. In Illinois, the average indoor radon concentration is 5.1 picocuries per liter (pCi/L)—which exceeds the Environmental Protection Agency (EPA) action level of 4 pCi/L. Shockingly, 45% of homes tested in Illinois have radon levels at or above this threshold.

O’Fallon, IL, is classified by the EPA as Zone 2, meaning that indoor radon screening levels are predicted to be between 2 and 4 pCi/L. While this is below the action level, elevated radon levels have been detected in homes throughout the region. According to the Illinois Emergency Management Agency (IEMA), radon has been found at dangerous levels across the state, regardless of location, making regular radon testing essential for every home.

About O'Fallon, IL

O'Fallon is a city in St. Clair County, Illinois, United States. The 2020 census listed the population at 32,289. The city is the second largest city in the Metro East region of the St. Louis metropolitan area and Southern Illinois. It sits 5 miles (8.0 km) from Scott Air Force Base and 18 miles (29 km) from Downtown St. Louis. Like its namesake in St. Charles County, Missouri, O'Fallon is part of the St. Louis metro area.

Map of O'Fallon, IL

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Our Services in Eureka, MO

Radon Testing

The only way to accurately determine your home’s radon levels is through professional testing. At Air Sense Environmental, we provide 48-hour radon tests using nationally approved, calibrated monitors for precise analysis. Our tests deliver same-day results, ensuring you have the information needed to protect your home and family.

Why Test for Radon?

  • Radon levels can fluctuate over time due to seasonal changes and home modifications.
  • The EPA recommends testing every 5 years, even if previous results were low.
  • Homes with active radon mitigation systems should be tested every 2 years to ensure continued effectiveness.
  • Early detection can prevent long-term health risks associated with radon exposure.

Radon Mitigation

If elevated radon levels are detected in your home, a radon mitigation system can significantly reduce the concentration of this hazardous gas. Our radon mitigation services are customized to your home’s structure and radon levels. We specialize in St. Louis radon mitigation, ensuring that your home meets EPA safety standards.

How Our Radon Mitigation Systems Work:

  • Sub-slab depressurization: The most effective method for reducing radon levels by venting radon gas from beneath your home.
  • Sealing cracks and openings: Helps prevent radon from entering your home through the foundation.
  • Continuous monitoring: Ensures your mitigation system remains effective over time.

Indoor Air Quality Testing

Beyond radon, our indoor air quality testing services help identify and mitigate other airborne pollutants such as mold spores, allergens, bacteria, viruses, and volatile organic compounds (VOCs). Using the Model 5200 IAQ Monitor, we provide real-time analysis of dust particles (PM2.5/PM10), chemical pollutants, CO2, carbon monoxide, and humidity levels.

Crawl Space Encapsulation

Protect your home’s foundation and indoor air quality with our crawl space encapsulation services. Moisture buildup in crawl spaces can lead to mold growth, structural damage, and poor air quality. We use AprilAire dehumidifiers to maintain ideal humidity levels and prevent moisture-related issues.

Benefits of Crawl Space Encapsulation:

  • Prevents mold, mildew, and wood rot
  • Improves indoor air quality
  • Enhances energy efficiency
  • Protects your home’s foundation from moisture damage

Indoor Air Quality Testing in Chesterfield, MO

Are You Breathing Clean Air?

Beyond radon, indoor air can contain harmful pollutants such as:

  • Allergens (pet dander, pollen, dust mites)
  • Mold spores and bacteria
  • Carbon monoxide (CO) and volatile organic compounds (VOCs)
  • Humidity imbalances causing discomfort and structural damage


We use the advanced Model 5200 IAQ Monitor to measure key air quality parameters, providing a thorough indoor air evaluation. Our services help homeowners and businesses maintain healthy indoor environments throughout the year.

Crawl Space Encapsulation in Chesterfield, MO

Protect Your Home from Moisture & Mold

Many homes in Chesterfield have crawl spaces prone to high humidity, leading to mold growth, wood rot, and poor air quality. Our crawl space encapsulation services include:

  • Sealing off moisture with durable vapor barriers
  • Installing high-performance AprilAire dehumidifiers
  • Preventing structural damage & pest infestations
  • Improving energy efficiency and air quality


Encapsulating your crawl space can eliminate musty odors, reduce allergens, and protect your home’s foundation.

Neighborhoods in O'Fallon, IL

Signal Hill, Empire, Gravois Park, St. Louis Place

Why Choose Air Sense Environmental?

Expert Radon Testing & Mitigation

We follow EPA and IEMA guidelines to ensure precise testing and effective mitigation.

Comprehensive Indoor Air Quality Solutions

We use advanced technology to assess and improve the air you breathe.

Trusted Partner in Home Health

We install and maintain AprilAire products, a leader in air quality since 1938.

Locally Owned & Operated

Dedicated to serving O’Fallon and the greater St. Louis area with top-tier indoor air quality solutions.

Schedule Your Radon Testing or Radon Mitigation System Assessment Today

Don’t wait until it’s too late—ensure the air in your home is safe. Contact Air Sense Environmental for professional radon testing and indoor air quality services in O’Fallon, IL. Our team is committed to providing the highest standard of service to protect you and your family from indoor air pollutants.

Call us today for a consultation and take the first step toward a healthier home!