Humidity: the 30 to 50 percent rule
Below 30%, your throat dries out and viruses last longer. Above 60%, mold and dust mites thrive.
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Air quality
1–8 of 8 guides
Temperature: comfort, sleep, productivity
ASHRAE defines a comfort zone. The bedroom is its own special case: cooler is better.
Barometric pressure: weather, altitude, headaches
Pressure rarely changes how the air feels, but it changes how the body feels. It is also the most reliable indoor weather forecast you have.
Lux: light, circadian rhythm, and screen time
Light is information your body uses to set its clock. Most indoor environments give it the wrong information.
Dew point: the number that says it's sticky
Relative humidity is relative to temperature. Dew point is absolute. If you want to know whether the air is "muggy," dew point is the number.
Apparent temperature: what your body feels
The thermometer reading is just the air. Heat index and wind chill account for humidity and wind: closer to what your body experiences.
Climate zone effects
The same reading means different things in cold-dry, hot-humid, and temperate climates. Knowing your zone tells you which problems to watch for.
Seasonal IAQ shifts
Winter, spring, summer, fall. The dominant indoor-air pressure changes with the calendar.
