CO₂ levels in a bedroom: when the number is too high
Bedroom CO₂ above 1,000 ppm is where most people start calling a room stuffy. What CO₂ levels in a bedroom mean, and what to try when the line keeps climbing.
Blog
Notes on the air indoors.
What PM2.5, CO₂, VOC, humidity and radon readings mean, and what to change when they run high.
PM2.5 indoor levels: what counts as a good number
A good indoor PM2.5 level is under 9.0 µg/m³ as a daily average. What PM2.5 indoor levels mean, where the particles come from, and what brings them down.
How to test indoor air quality in your home
To test indoor air quality, measure PM2.5, CO₂, humidity, VOCs and radon in the rooms you use. Here is how to test indoor air quality at home, room by room.
White-label air quality monitors for home service companies
A white-label air quality monitor carries your logo, your domain and your price. What the partner program brands, what it doesn't, and what to ask first.
How to add an indoor air quality business line
An indoor air quality business starts with monitoring: preconfigured kits under your own brand, readings homeowners can see, and a reason to call back.
Does a MERV 13 filter change your PM2.5 reading?
A MERV 13 filter only lowers your indoor PM2.5 reading while the HVAC fan is running, and the EPA puts that at under 25% of the time. How to test yours.
Wildfire smoke and indoor air: how to keep it out
With the windows shut, indoor PM2.5 still runs about 55% to 60% of the outdoor level. How wildfire smoke reaches indoor air, and four fixes that keep it out.