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= measured concentration of a dry gas having a measured volume % CO 2Īs an example, a measured particulates concentration of 200 mg/m 3 in a dry gas that has a measured 8 volume % CO 2 is: Formula: concentration (mg/m3) 0.0409 x concentration (ppm). = corrected concentration of a dry gas having a specified reference volume % CO 2 The temperature of the atmosphere also has an influence on the calculation. At an ambient sea level atmospheric pressure of 1 atm (101.325 kPa or 1.01325 bar), the general equation is: The conversion equations depend on the temperature at which the conversion is wanted (usually about 20 to 25 ☌). 3.3 Correcting to a reference carbon dioxide contentĬonverting air pollutant concentrations Example: If a chlorine gas concentration of 15 ppm were added to a storage tank holding 2.5 MG, how many lbs of chlorine would be needed (Gas) lbs (Vol, MG) x (Dosage, mgl) x (8.34 lbs/gal) Chlorination box 2 2.3.2 Correcting to a reference oxygen content.3 Correcting concentrations for reference conditions.2 Correcting concentrations for altitude.
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1 Converting air pollutant concentrations.This article presents methods for converting concentrations from ppmv to mg/m 3 (and vice versa) and for correcting the concentrations to the required reference conditions.Īll of the concentrations and concentration corrections in this article apply only to air and other gases. Some express the concentrations as ppmv ( parts per million by volume) and some express the concentrations as mg/m 3 (milligrams per cubic meter), while others require adjusting or correcting the concentrations to reference conditions of moisture content, oxygen content or carbon dioxide content. Such regulations involve a number of different expressions of concentration. Finally, remember that one percent concentration expressed in parts per million is therefore written as. Regulations that define and limit the concentration of pollutants in the ambient air or in gaseous emissions to the ambient air are issued by various national and state (or provincial) environmental protection and occupational health and safety agencies. Remember next that parts one part per million means 1 in a million, so we can write. Air pollutant concentrations, as measured or as calculated by air pollution dispersion modeling, must often be converted or corrected to be expressed as required by the regulations issued by various governmental agencies.