New Hampshire Indoor Air Quality Guide
New Hampshire well water can carry dissolved radon gas directly into homes
Zone 1 — Highest potential (predicted average > 4 pCi/L)
Radon Levels in New Hampshire
Average Radon Level
5.7 pCi/L
EPA Zone
Zone 1
New Hampshire is entirely Zone 1. The state's White Mountain granite bedrock produces consistently high radon. Hillsborough and Rockingham counties average above 6 pCi/L.
⚠️ Testing strongly recommended
New Hampshire 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 New Hampshire
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.
New Hampshire Climate & Air Quality Factors
Harsh New England winters with 6+ months of heating. Many homes use oil or wood heat with CO risks. Mobile homes are common and have unique ventilation issues. High well water usage can carry radon into homes.
Recommended Products for New Hampshire 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.
Product links are affiliate links. As an Amazon Associate, we earn from qualifying purchases.