# SIP - ALASKA - 18 AAC 50.010

**18 AAC 50.010. AMBIENT AIR QUALITY STANDARDS**

(1) for PM-10:

(A) expected annual arithmetic mean of 50 micrograms per cubic meter; and

(B) 24-hour average of 150 micrograms per cubic meter, with this standard being attained when the expected number of days in a calendar year with a 24-hour average concentration above 150 micrograms per cubic meter is less than or equal to one day;

- (2) for sulfur oxides, measured as sulfur dioxide:

(A) annual arithmetic mean of 80 micrograms per cubic meter;

(B) 24-hour average of 365 micrograms per cubic meter not to be exceeded more than once each year; and

(C) three-hour average of 1300 micrograms per cubic meter not to be exceeded more than once each year;

- (3) for carbon monoxide:

(A) eight-hour average of 10 milligrams per cubic meter not to be exceeded more than once each year; and

(B) one-hour average of 40 milligrams per cubic meter not to be exceeded more than once each year;

- (4) for ozone: one-hour average of 235 micrograms per cubic meter, with this standard being attained when the expected number of days in a calendar year with a maximum hourly average concentration above 235 micrograms per cubic meter is less than or equal to one day;

(5) for nitrogen dioxide: annual arithmetic mean of 100 micrograms per cubic meter;

(6) for lead: quarterly arithmetic mean of 1.5 micrograms per cubic meter;

*State effective: 10/1/04; EPA effective: 9/13/07*