Packet: Tiffin City Council Work Session (09/15/2026)

CHAPTER 166 ESTABLISHMENT OF ZONING DISTRICTS AND THE OFFICIAL ZONING MAP p.m. Such activities are those that are non-routine operations accessory to the primary activities and that are temporary in nature, or conducted infrequently. iii. Transient vibrations of moving sources such as automobiles, trucks, airplanes, and railroads. (3) Smoke and Particulate Matter. Any emission from a lot of particulate matter containing more than five percent by weight of particles having a particle diameter larger than 44 microns is prohibited. Dust and other types of air pollution borne by the wind from such sources as storage areas, yards, and roads within the boundaries of any lot must be kept to a minimum by appropriate landscaping, paving, oiling, or other acceptable means. Emission of particulate matter from such sources in excess of the weight limitations specified herein is prohibited. The emission of smoke or particulate matter of a density or equivalent opacity equal to, or greater than, Ringelmann Chart No. 2 is prohibited at all times, except as otherwise provided herein. (The Ringelmann Chart is the chart published by the United States Bureau of Mines). a. Smoke Emission. In the M-2 District, the emission of more than 12 smoke units per stack in any one-hour period is prohibited. However, once during any six-hour period each stack may be permitted up to 12 additional units in a 15-minute period for soot blowing and fire cleaning. Only during such 15 minute periods may smoke of a density or equivalent opacity equal to, but not exceeding, Ringelmann Chart No. 3 be permitted, and then only for fire cleaning and for not more than four minutes per period. b. Particulate Matter. The rate of emission particulate matter from all sources within the boundaries of any lot shall not exceed the rate established in the following table: Maximum Permitted Particulate Matter Emission Rate Height of Emission Pounds Per Hour (ft) (per acre) 0-49 1.00 50-99 1.01 100-149 1.06 150-199 1.10 200-299 1.16 300-399 1.30 400-over 1.50 c. Method of Measurement. i. Smoke. To grade the density or equivalent opacity of emission of smoke, the Ringelmann Chart shall be used. To determine smoke units, the Ringelmann reading shall be made at least every minute during the period of observation. Each reading (Ringelmann number) shall be multiplied by CODE OF ORDINANCES, TIFFIN, IOWA - 1734 -