# Indoor Air Quality in O’Fallon, MO

- **URL:** https://airsenseenvironmental.com/service-area/ofallon-mo/indoor-air-quality/
- **Published:** 2026-07-20

Skip to content Radon Mitigation Services ▾ Radon Testing Commercial Radon Mitigation Commercial Radon Testing Indoor Air Quality Crawl Space Encapsulation Service Area Resources FAQ Blog Podcast Reviews & Projects About Us Contact 314-664-9807 Free Estimate Radon Mitigation Services Radon Testing Commercial Radon Mitigation Commercial Radon Testing Indoor Air Quality Crawl Space Encapsulation Company Service Area Resources FAQ Blog Podcast Reviews & Projects Media Room About Us Contact Call 314-664-9807 Home › Service Area › O’Fallon, MO › Indoor Air Quality Service Area · Ofallon, MO Indoor Air Quality in O’Fallon, MO An indoor air quality test in O'Fallon, MO is a 48-hour continuous monitoring assessment, not a spot check. Air Sense Environmental records particulates, VOCs, CO2, CO, temperature and humidity in O'Fallon homes at one-minute intervals and turns the data into a written report with specific fixes. IEMA-Certified NRPP-Certified Free In-Home Estimates Call 314-664-9807 Get a Free Estimate What does an indoor air quality test measure in a O'Fallon home? Particulate matter (PM2.5 and PM10) from cooking, candles, smoke and HVAC systems Chemical vapors (VOCs) from paints, cleaners, new flooring and furniture Carbon dioxide and carbon monoxide, which point to ventilation and combustion problems Temperature and relative humidity; sustained humidity above 60 percent is a warning sign Radon (optional), measured against the EPA action level of 4.0 pCi/L When should O'Fallon homeowners test indoor air quality? O'Fallon is the largest suburb of St. Louis, with more than 90,000 residents, and most of its housing went up between the 1990s and 2010s on poured basements set into St. Charles County's silty clay soils. These are the situations and O'Fallon home types where a test pays off: Allergy or respiratory symptoms that ease when you leave the house After a renovation, new flooring or new furniture Humidity that stays high, or a musty smell from a basement or crawl space Before buying or selling a home 1990s and 2000s subdivision homes on poured basements along Highway K and Highway N Homes in the older core near Main Street and the original town How does indoor air quality testing work in O'Fallon? Monitor placement. One or more continuous monitors go in the rooms where the family spends its time. 48 hours of data. Readings are logged at one-minute intervals through normal daily life. Written report. You see each pollutant against its healthy range, with the specific fix for anything outside it. What happens after the indoor air quality results? The report names the problem, and Air Sense Environmental installs the fix it calls for: an AprilAire whole-home dehumidifier for high humidity, an energy recovery ventilator for stale air and rising CO2, or a radon mitigation system when radon is at or above 4.0 pCi/L. The main indoor air quality testing page covers the equipment and the full process. How much does indoor air quality testing cost in O'Fallon, MO? Pricing depends on the size of the O'Fallon home and how many monitoring locations it needs; most single-family homes need one or two monitors. Call 314-664-9807 for a free consultation and an exact quote. O'Fallon neighborhoods and nearby communities Air Sense Environmental works across O'Fallon, MO, including the Highway K corridor, the original town along Main Street and the neighborhoods toward Dardenne Prairie, in ZIP codes 63366 and 63368. Nearby communities with their own service pages: Air quality and radon services in St. Peters, MO Air quality and radon services in St. Charles, MO Air quality and radon services in Wentzville, MO All Air Sense Environmental service areas From Our Work Explore More From Air Sense More in O’Fallon, MO O’Fallon, MO hubRadon Mitigation in O’Fallon, MORadon Testing in O’Fallon, MO Indoor Air Quality Nearby Indoor Air Quality in St. Charles, MOIndoor Air Quality in St. Louis, MOIndoor Air Quality in St. Peters, MOIndoor Air Quality in Ballwin, MOIndoor Air Quality in Belleville, ILIndoor Air Quality in Chesterfield, MOIndoor Air Quality in Edwardsville, IL Learn More Indoor Air Quality in St. Louis, MOAll Service AreasReviews & ProjectsGet a Free Estimate Get Your Number Radon under control. Air you can trust. Free in-home estimate, custom-designed system, 24-hour availability. Call 314-664-9807 5237 Old Alton Edwardsville Rd Edwardsville, IL 62025 314-664-9807 · Open 24 hours NRPP-Certified · IEMA License #RNM20232346 Services Radon Mitigation Radon Testing Commercial Radon Commercial Radon Testing Radon Fan Replacement Sub-Slab Depressurization Indoor Air Quality Crawl Space Encapsulation Company About Us Service Area Reviews & Projects FAQ Blog Podcast Resources Media Room Contact © 2026 Air Sense Environmental. All rights reserved. Radon Mitigation & Testing · St. Louis, MO & Metro East, IL Call 314-664-9807 Free Estimate