Last updated: 2026-05-23
Idaho Indoor Air Quality Guide
Idaho has the 3rd highest radon levels in the US — testing is critical
Zone 1 — Highest potential (predicted average > 4 pCi/L)
Radon Levels in Idaho
Average Radon Level
7.4 pCi/L
EPA Zone
Zone 1
Idaho is entirely Zone 1. The state's granitic and volcanic geology produces very high radon. Boise metro and Idaho Falls consistently test above 4 pCi/L.
⚠️ Testing strongly recommended
Idaho is Zone 1 — the highest risk category. Test every home. If levels are 4 pCi/L or above, install a mitigation system immediately.
Top Indoor Air Hazards in Idaho
Radon Gas
CRITICALRadon is the #2 cause of lung cancer after smoking. It seeps from soil into basements and crawl spaces. You cannot see, smell, or taste it. The only way to know is to test.
Carbon Monoxide (CO)
CRITICALCO is a silent killer — colorless, odorless, and lethal at high concentrations. It binds to hemoglobin 200x more than oxygen. Every home with fuel-burning appliances needs a CO detector.
Poor Ventilation (Stale Air)
MODERATEModern energy-efficient homes trap pollutants indoors. Without adequate ventilation, CO2, VOCs, and airborne pathogens accumulate to levels 2-5x higher than outdoors. This is called sick building syndrome.
Idaho Climate & Air Quality Factors
Cold winters with temperature inversions trap pollutants in valleys. Wildfire smoke from forest fires is a recurring severe threat. Many homes have basements that concentrate radon.
Recommended Products for Idaho Homes
First Alert Radon Gas Test Kit
EPA-listed short-term radon test. Lab fees included. Results in days.
Airthings Corentium Home Radon Detector
Continuous digital radon monitoring. No lab fees. Real-time readings.
RadonAway RP140 Radon Mitigation Fan
Professional-grade radon mitigation fan. 4-inch. The core component of any radon reduction system. Cuts radon levels by up to 99%.
Kidde Carbon Monoxide Detector
Plug-in CO alarm with battery backup. Digital display. Peak level memory.
Disclaimer
State-level radon data from EPA Zone Map. Individual home levels vary significantly. This guide is for educational purposes and not a substitute for professional environmental testing. Test your home regardless of zone designation.
Guidance sourced from EPA, CDC, and Health Canada publications.