"The two species could be measured separately with a limit of quantification of 3 ppm."

The SafeAir passive is a personal equipment dedicated to monitoring exposure to toxic gases over exposure times ranging from 15 minutes to 24 hours. Small and discreet, the SafeAir chemical detection badge detects the presence of gas even at very low concentrations by changing color.

Concentration of a pollution in a limited space as a room depends on the amount of polluted material spread in the room, supply of fresh air, outlets positions and construction, principles used for supply and outlet from the space

I have asked two times the following question:I want to calculate the gas concentration, in ppm, in the closed chamber of volume 1025 cm3. I have a cylinder of mixture of NH3 and air with the 10...

When measuring gases like carbon dioxide, oxygen, or methane, the term concentration is used to describe the amount of gas by volume in the air. The 2 most common units of measurement are parts-per

*****!!!!****!!!!*** {Provides excellent definitions of ppm in air vs. liquid, etc} [Helpful note: Molecular weight of Chlorine Dioxide is 67.45] The unit of gas concentration is converted into another unit.