### FORINCLUSION IN WYOMING STATE IMPLEMENTATION PLAN FROM WYOMING AIR QUALITY STANDARDS AND REGULATIONS

Ambient Standards 

### CHAPTER2

Section 2. 

### Ambient standards for particulate matter. (a) 

### PM 10: The ambient air standards for 

### PM 10 particulate matter are: (i) 50 micrograms per cubic meter annual arithmetic mean. (iii) 150 micrograms per cubic meter--24-hour average concentration with not more than one expected exceedance per year. (iHA) Attainment ofthe annual and 24-hour standards is determined in accordance with Appendix K of40 CFRpart 50. 

## (will For the purpose ofdetermining attainment ofthe standards, particulate matter shall be measured in the ambient air as 

### PM10 (particles with an aerodynamic diameter less than or equal to a nominal 1 0 micrometers), by a reference method based on 40 CFRpart 50, Appendix J and designated in accordance with 40 CFR part 53 or an equivalent or alternate method designated in accordance with 40 CFRpart 53

. (b) 

### PM2 5: The primary and secondary ambient air quality standards for 

### PM2 5 particulate matter are: (i) 15 micrograms per cubic meter Cug/m3) annual arithmetic mean concentration and: (ii) 35 micrograms per cubic meter (Ug/m3)--98th percentile 24-hour average concentration. (iii) Attainment ofthe annual and 24-hour standards is determined in accordance with Appendix N of40 CFRpart 50. Civ) Forthepurpose ofdetermining attainment ofthe standards. particulate matter shall be measured in the ambient air as 

### PMz 5 (particles with an aerodynamic diameter less than orequal to a nominal 2.5 micrometers). by a reference method based on40 CFR part 50. Appendix L and designated in accordance with 40 CFR part 53 or an equivalent or alternate method designated in accordance with 40 CFRpart 53.

### (c) Ambient air, for the areabounded by Townships 40 through 52 North, and Ranges 69 through 73 West, inclusive, ofthe Sixth Principal Meridian, Campbell and Converse Counties, in the Powder River Coal Basin, is defined as that portion ofthe atmosphere, external to buildings, to which the general public has access. For surface mining operations, the application ofthis definition will be limited to onlythose lands that are necessary to conduct mining operations as determined by the Administrator of the Wyoming Air Quality Division

.Section 10. 

### Ambient standards for lead. (a) The orimary and secondary ambient air quality**standard~** for lead CPb) and its compounds, measured as elemental lead by a reference method based upon 40 CFR 50.12 Appendi)c Gorby an equivalent method designated in accordance with 40 CFRpart 53 is 1.5 micrograms per cubic meter, mmcimum arithmetic mean averaged over a calendar quarter. are 0.15 micrograms per cubic meter. arithmetic mean concentration over a 3- month period. measured inthe ambient air as Pb eitherby: (i) A reference method based on 40 CFRpart 50. Appendix G (Reference Method for the Determination ofLead in Suspended Particulate Matter Collected From Ambient Air). and designated in accordance with 40 CFRpart 53 or: (ii) An equivalent method designated in accordance with40 CFRpart 53. Cb) The orimary and secondary ambient air quality standards for Pb are metwhen the maximum arithmetic 3-month mean concentration for a 3-yearperiod. as determined in accordance with Appendix R Cinteroretation ofthe National AmbientAir Quality Standards for Lead) of40 CFRpart 50. is less than or equal to 0.15 micrograms percubic meter.

### Section 12. Incorporation by 

### reference. (a) Code ofFederal Regulations CCFR). All Code ofFederalRegulations CCFRs) cited in this chapter. including their Appendices. revised and published as ofJuly 1. 2008. not including any later amendments. are incornorated by reference. Copies of the Code ofFederal Regulations are available for public inspection and copies canbe obtained at cost from the Department ofEnvironmental Oualitv. Division ofAir Quality. 122 W. 25th Street. Cheyenne. Wyoming 82002. Copies ofthe CFRs can also be obtained at cost from Government Institutes. 15200 NBN Way. Building B. Blue Ridge Summit. PA 17214.