Washington Administrative Code
Title 173 - Ecology, Department of (See also Titles 197, 317, 372, and 508)
Chapter 173-476 - Ambient air quality standards
Section 173-476-130 - Ambient air quality standards for sulfur oxides (sulfur dioxide)
Universal Citation: WA Admin Code 173-476-130
Current through Register Vol. 24-06, March 15, 2024
(1) Standard for sulfur oxides (measured as sulfur dioxide).
(a) Annual. The annual average concentration
for sulfur oxides in the ambient air must not exceed 0.02 ppmv in a calendar
year.
(b) Twenty-four-hour. The
twenty-four-hour average concentration for sulfur oxides in the ambient air
must not exceed 0.14 ppmv more than once per calendar year. The
twenty-four-hour averages must be determined from successive nonoverlapping
twenty-four-hour blocks starting at midnight each calendar day.
(c) Three-hour. The three-hour average
concentration for sulfur oxides in the ambient air must not exceed 0.5 ppmv
more than once per calendar year. The three-hour averages must be determined
from successive nonoverlapping three-hour blocks starting at midnight each
calendar day.
(d) One-hour. The
three-year average of the annual ninety-ninth percentile of the daily maximum
one-hour average concentrations for sulfur oxides in the ambient air must not
exceed 75 ppbv.
(2) Measurement method. The levels of sulfur oxides must be measured as sulfur dioxide by:
(a) A FRM based on 40
C.F.R. Part 50, Appendix A-1 or A-2; or
(b) A FEM designated according to 40 C.F.R.
Part 53.
(3) Interpretation methods.
(a) The
annual arithmetic mean is based on the average of hourly data. To be used in
calculating the annual average, the hourly data must be at least seventy-five
percent complete in each calendar quarter of the year.
(b) The interpretation method for the
twenty-four-hour average found in 40 C.F.R. Part 50.4(d) must be
followed.
(c) The interpretation
method for the three-hour average found in 40 C.F.R. Part 50.5(c) must be
followed.
(d) The interpretation
method for the one-hour average found in 40 C.F.R. Part 50, Appendix T must be
followed.
(4) Rounding of values.
(a) The
annual arithmetic mean and twenty-four-hour averages must be rounded to two
decimal places. Fractional parts equal to or greater than 0.005 ppmv must be
rounded up.
(b) The three-hour
standard averages must be rounded to one decimal place. Fractional parts equal
to or greater than 0.05 ppmv must be rounded up.
(5) Sunset provision. The ambient standards in WAC 173-476-130(1)(a) and (b) are no longer applicable in a specific area one year after the effective date of the EPA's designation of attainment status of that area for the standard in WAC 173-476-130(1)(d) and 40 C.F.R. 50.17.
Disclaimer: These regulations may not be the most recent version. Washington may have more current or accurate information. We make no warranties or guarantees about the accuracy, completeness, or adequacy of the information contained on this site or the information linked to on the state site. Please check official sources.
This site is protected by reCAPTCHA and the Google
Privacy Policy and
Terms of Service apply.