ILLINOIS POLLUTION CONTROL BOARD

July

1g.,

1975

IN THE MATTER OF

)

PROPOSED AIR QUALITY STANDARDS

)

R72-7

ORDER

OF

THE

BOARD

(by

Mr.

Dumelle):

The

Illinois Pollution Control Board

(Board) hereby adopts

the

following sulfur dioxide ambient air quality standard as an

amendment

to the Air Pollution Regulations:

Rule 308:

Sulfur Oxides

(Sulfur Dioxide)

(a)

Primary Standards.

The primary ambient air quality

standards for sulfur oxides measured as sulfur dioxide

are:

(A)

an annual arithmetic mean concentration of

80

micrograms per cubic meter

(0.03 ppm);

and

(B)

a maximum

24—hour concentration not to be exceeded more than once

per year of

365 micrograms per cubic meter

(0.14 ppm).

(h)

Secondary Standard.

The secondary ambient air

quality standard for sulfur oxides measured as

sulfur

dioxide is a maximum 3—hour concentration not to be

exceeded more than once per year of 1,300 micrograms

per cubic meter

(0.5 ppm).

(c)

Measurement Method.

For determining conformance

with sulfur oxide air quality standards,

sulfur oxides

shall be measured as sulfur dioxide by the pararosaniline

method as described in 40 CFR Part 50, National Primary

and Secondary A~thientAir Quality Standards, Appendix

A, or

by

an equivalent method of proof approved by the

Agency.

I,

Christan

L.

Moffett, Clerk of the Illinois Pollution Control

Board, hereby certify

the above Order was adopted on the

/~~‘

day

of July,

1975 by

a vote of ___________________________

~f~off4l~k

Illinois Pollution~

ntrol Board

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