Notes: Meteorological data includes wind speeds which may be expressed as statute miles per hour, knots, or meters per second.
For example, such a regulation might limit the concentration of NOx to 55 ppmv in a dry combustion exhaust gas corrected to 3 volume percent O2.
As another example, a regulation might limit the concentration of particulate matter to 0.1 grain per standard cubic foot (i.e., scf) of dry exhaust gas corrected to 12 volume percent CO2.
Environmental agencies in the USA often denote a standard cubic foot of dry gas as "dscf" or as "scfd".
Likewise, a standard cubic meter of dry gas is often denoted as "dscm" or "scmd" (again, by environmental agencies in the USA).