Multi-Sector Air Pollutants Regulations

Marginal note:Concentrations of NO_x and O₂

• 28 (1) For each test run, the measurements of the concentration of NO_x, expressed in ppmvd, and the concentration of O₂, expressed as a percentage determined by volume on a dry basis, in the boiler’s or heater’s flue gas must be made simultaneously and in accordance with either

  • (a) the following EPA methods:

    • (i) [Repealed, SOR/2025-229, s. 10]

    • (ii) for the concentration of NO_x, EPA Method 7E, and

    • (iii) for the concentration of O₂, EPA Method 3A; or

  • (b) ASTM D6522-11 and, for the location of the sampling port and its traverse points, EPA Method 1 or EPA Method 1A, as applicable.

• Marginal note:Exception — EC Method A

  (2) Despite subsection (1), the location of the sampling port and its traverse points may be determined for the purpose of that subsection in accordance with EC Method A.