NOₓ: gas stoves, traffic, asthma
Nitrogen oxides come from combustion. Indoors, the main source is a gas stove. The health link with childhood asthma is robust.
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How interpretation works
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Ultrafine particles: what the sensor cannot see directly
Below 100 nanometers, particles get small enough to cross from lungs into bloodstream. The SEN66 sees PM₁ but stops there.
Sulfur dioxide: the outdoor number for fuel and fire
SO₂ comes from burning sulfur-bearing fuels: coal, heavy oil, diesel ships, volcanic activity, and wildfires. The device does not measure it; the dashboard pulls it from Open-Meteo.
Gas-stove cooking: the fingerprint
A pan on a gas burner produces a remarkably consistent multi-pollutant signature: NOx, fine and ultrafine particles, VOCs, and humidity, rising and falling together. Each cooking method leaves its own version of it.
Candles and incense: small flame, big PM spike
A single candle can push a small room past 100 µg/m³ PM₂.₅ in under ten minutes. Incense is worse.
Attached garages: the highest-risk source in most homes
A running engine ten feet from your living space. Cold-start emissions are the worst. Door seals matter more than you think.
Wood stoves and fireplaces
Solid-fuel combustion produces the largest, longest-lasting PM event most homes ever see indoors. Even a well-tended fire shifts the baseline for hours.
Vaping, smoking, and cannabis
Tobacco smoke, cannabis smoke, and vape aerosol all show on the sensor, and their health profiles differ significantly. Here is what each looks like indoors, how it travels, and what helps.
Combustion sources, an overview
Anything that burns indoors produces a multi-pollutant signature: NOx, fine particulates, VOCs, ultrafines, and (sometimes) CO. The dashboard has a shared interpretation framework for all of them.
Reducing NO₂ and NOₓ indoors: source elimination first
Indoor NOₓ comes from combustion. The intervention hierarchy starts with eliminating sources and ends with capture-and-exhaust for what remains.
NOx Index vs NO₂
NOx Index is a combustion-pattern signal. It is not a regulatory NO₂ concentration measurement.
