Massachusetts Indoor Air Quality Guide
Massachusetts has the oldest housing stock in the nation — 70% built before 1980
Zone 1 — Highest potential (predicted average > 4 pCi/L)
Radon Levels in Massachusetts
Average Radon Level
5.0 pCi/L
EPA Zone
Zone 1
Massachusetts is largely Zone 1. The state's glacial geology produces elevated radon throughout. Worcester County averages above 6 pCi/L.
⚠️ Testing strongly recommended
Massachusetts 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 Massachusetts
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.
Lead Paint Dust
CRITICALLead paint was banned in 1978 but remains in millions of homes. Sanding, scraping, or peeling paint releases lead dust that causes irreversible brain damage in children. There is no safe level of lead exposure.
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.
Massachusetts Climate & Air Quality Factors
Harsh winters drive long heating seasons. Boston's triple-decker homes often have aging heating systems with CO risks. Old housing stock means widespread lead paint. High population density means shared wall exposures.
Recommended Products for Massachusetts 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%.
3M LeadCheck Instant Lead Test Kit
Instant results. EPA-recognized. Test paint, dust, and soil.
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.
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