SECOND CLASS CITIES, SMOKE EMISSIONS REGULATED Act of 1911, P.L. 667, No. 257 Cl. 11 AN ACT Authorizing cities of the second class to regulate the production or emission of smoke from chimneys, smokestacks, or other source. Section 1. Be it enacted, &c., That cities of the second class shall have the power to regulate by ordinance the production or emission of smoke from any chimney, smokestack, or other source.