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.
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Precipitation: the great atmospheric scrubber
Rain and snow wash particles out of the air, but not all sizes equally: pollen, dust and the tiniest particles go quickly, while most fine-particle mass lingers.
Cloud cover and photochemistry
Cloudy days produce less outdoor ozone. Sunny days produce more. Ozone forecasts build that in, and Terrestream reads the ozone forecast for your home's location.
Snow depth and winter IAQ
Fresh snow scrubs particulates from outdoor air. Persistent snow traps cold air at the surface, sometimes for days, with all that implies for inversions.
