Sec. 31.01. All active underground working places in a mine shall be ventilated by a current of air containing not less than 19.
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/il/chapter-225/act-705/31-01A research copy — for the controlling text, always check the official state or federal source. Not legal advice.
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.