indoor air quality testing 4
https://theradonmitigationzone.yousher.com/what-radon-mitigation-installation-involves-a-practical-guide-for-homeowners
Indoor air quality testing uses specialized sensors to measure pollutants like mold, VOCs, carbon dioxide, and particulate matter that build up in sealed homes and offices. I had our HVAC ducts tested last spring because my allergies got worse after the energy retrofit. The handheld monitor showed PM2.5 spiking near the kitchen, so we added a range hood that vents outside.