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Several units of measurement are commonly applied to ozone: ppm - parts per million, usually parts per million volume (ppmV), detailing the number of molecules of ozone per million molecules of "air". Dobson Units (DU) - The number of ozone atoms in a column of atmosphere with a width and depth of a centimeter2 or meter2, and the entire height of the atmosphere from Earth's surface to the Sun (or the satellite measuring it). %wt or %vol - for a given amount of gas, how much of its mass (%wt) or volume (%vol) is just ozone. (Common for ozone generators.) mass/unit volume, pascals (partial pressure), and I won't atempt to chew up these definitions...

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16y ago

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