Sec. 231-13.7. Table 7—Federal class I variance maximum allowable increase concentrations

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Contaminant	Maximum allowable increase (micrograms per cubic meter)
Particulate Matter:
PM-10, annual arithmetic mean	17
PM-10, 24-hr maximum	30
PM-2.5, annual arithmetic mean	4
PM-2.5, 24-hr maximum	9
Sulfur dioxide:
Annual arithmetic mean	20
24-hr maximum	91
3-hr maximum	325
Nitrogen dioxide:
Annual arithmetic mean	25

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both filterable and condensable fractions are to be included (see definitions of PM-10 and PM-2.5 in Part 200 of this Title).

                    
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