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 Environmental Protection Agency 40 CFR Part 58
 CFR Correction In Title 40 of the Code of Federal Regulations, Parts 53 to 59, revised as of July 1, 2008, on page 271, in appendix G to part 58, Table 2 is corrected to read as follows: Appendix G to Part 58—Uniform Air Quality Index (AQI) and Daily Reporting 
 
 
 Table 2—Breakpoints for the AQI
These breakpoints
Equal these AQI'sO3
                                 (ppm)
                                 8-hour
O3
                                 (ppm)
                                 
                                    1-hour 1
PM2.5 
                                    (μg/m3
                                    )
PM10 
                                    (μg/m3
                                    )
CO (ppm)
SO2
                                 (ppm)
NO2
                                 (ppm)
AQI
Category0.000-0.059

0.0-15.4
0-54
0.0-4.4
0.000-0.034
(3
                                )
0-50
Good.0.060-0.075

15.5-40.4
55-154
4.5-9.4
0.035-0.144
(3
                                )
51-100
Moderate.0.076-0.095
0.125-0.164
40.5-65.4
155-254
9.5-12.4
0.145-0.224
(3
                                )
101-150
Unhealthy for Sensitive Groups.0.096-0.115
0.165-0.204
4
                                 65.5-150.4
255-354
12.5-15.4
0.225-0.304
(3
                                )
151-200
Unhealthy.0.116-0.374
0.205-0.404
4
                                 150.5-250.4
355-424
15.5-30.4
0.305-0.604
0.65-1.24
201-300
Very Unhealthy.(2
                                )
0.405-0.504
4
                                 250.5-350.4
425-504
30.5-40.4
0.605-0.804
1.25-1.64
301-400(2
                                )
0.505-0.604
4
                                 350.5-500.4
505-604
40.5-50.4
0.805-1.004
1.65-2.04
401-500
Hazardous.1
                             Areas are generally required to report the AQI based on 8-hour ozone values. However, there are a small number of areas where an AQI based on 1-hour ozone values would be more precautionary. In these cases, in addition to calculating the 8-hour ozone index value, the 1-hour ozone index value may be calculated, and the maximum of the two values reported.2
                             8-hour O3
                             values do not define higher AQI values (≥ 301). AQI values of 301 or greater are calculated with 1-hour O3
                             concentrations.3
                             NO2
                             has no short-term NAAQS, and can generate an AQI only above the value of 200.4
                             If a different SHL for PM2.5
                             is promulgated, these numbers will change accordingly.


[FR Doc. E9-15326 Filed 6-25-09; 8:45 am] BILLING CODE 1505-01-D