HB 1670 -- Sales Tax Exemption for Pollution Controls Sponsor: Cooper (120) This bill removes the required certification by the Director of the Department of Natural Resources before a sales and use tax exemption applies when purchasing or leasing machinery, equipment, appliances, and devices used solely to prevent, abate, or monitor water or air pollution and any materials and supplies used in the installation, construction, or reconstruction of the machinery, equipment, appliances, and devices.Copyright (c) Missouri House of Representatives