(225 ILCS 705/31.01) (from Ch. 96 1/2, par. 3101)
Sec. 31.01.
All active underground working places in a mine shall be
ventilated by a current of air containing not less than 19.5% of oxygen,
not more than 0.5% of carbon dioxide, and no harmful quantities of other
noxious or poisonous gases. The volume and velocity of the current of air
shall be sufficient to dilute so as to render harmless, and to carry away,
flammable or harmful gases.
(Source: Laws 1953, p. 701.)
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