Update sensor.mhz19.markdown #855
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CO2 level outside isn't 250 - 350pmm, but assumed to be 400ppm. It has risen over the years, due to global warming :-( Most sensors that do automatic calibration assume 400ppm as lowest. See also https://www.co2.earth/ for actual CO2 level on the earth.
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CO2 level outside isn't 250 - 350pmm, but assumed to be 400ppm. It has risen over the years, due to global warming :-(
Most sensors that do automatic calibration assume 400ppm as lowest.
See also https://www.co2.earth/ for actual CO2 level on the earth.