Section 243.120  PM-10

a)         Standards.  The ambient air quality standards for PM-10 are:

1)         An annual arithmetic mean concentration of 50 micrograms per cubic meter; and

2)         A maximum 24-hour concentration of 150 micrograms per cubic meter, not to be exceeded more than once per year.

b)         Measurement Method.  For determining conformance with the PM-10 ambient air quality standards, PM-10 shall be measured by the method described in 40 CFR 50, Appendix J (incorporated by reference in Section 243.108).  The computations necessary for analyzing particulate matter data to determine attainment of the PM-10 standards are described in 40 CFR 50, Appendix K (incorporated by reference in Section 243.108).

(Source:  Added at 16 Ill. Reg. 8185, effective May 15, 1992)