131.The measurements taken to monitor compliance with the limit values set out in section 130 are expressed as units of mass per cubic metre of dry combustion gas, at a reference temperature of 25 °C and pressure of 101.3 kPa, corrected to 11% oxygen according to the following formula:
E = Ea x (9.9 / (20.9 -A))
“E” is the corrected concentration;
“Ea” is the dry concentration at the above temperature and pressure; and
“A” is the percentage of oxygen, on a dry basis, in the combustion gases at the sampling point.