A. Compliance Required: Any use established in the M-1 Restricted Manufacturing District after the effective date hereof shall be so operated as to comply with the performance standards governing smoke and particulate matter established on the effective date hereof and shall be permitted to be altered, enlarged, expanded or modified, provided that new sources of smoke and/or particulate matter conform to the performance standards established hereinafter. The total emission weight of particulate matter from all sources within the boundaries of the lot shall not exceed the net amount permitted in the M-1 District after such alteration, enlargement or modification.
B. Prohibited Emissions:
1. In addition to the performance standards specified hereinafter, the emission of smoke or particulate matter in such manner or quantity as to be detrimental to or endanger the public health, safety, comfort or welfare is hereby declared to be a public nuisance and shall henceforth be unlawful.
2. The emission, from all sources within any lot area of particulate matter containing more than ten percent (10%) by weight of particles having o particle diameter larger than forty four (44) microns is prohibited.
3. Dust and other types of air pollution borne by the wind from such sources as storage areas, yards, roads and so forth within the lot boundaries shall 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 hereinafter is prohibited.
C. Ringelmann Chart: For the purpose of grading the density of smoke, the Ringelmann Chart, published and used by the United States Bureau of Mines, shall be employed. The emission of smoke or particulate matter of a density greater than number two (2) on the Ringelmann Chart is prohibited at all times, except as otherwise provided hereinafter.
D. Emission Limits: In the M-1 Restricted Manufacturing District, the emission of more than twenty (20) smoke units per hour per stack is prohibited, including smoke of a density in excess of Ringelmann Number two (2). However, once during any six-hour period, each stack may emit up to thirty five (35) smoke units, not to exceed Ringelmann Number two (2) when blowing soot or cleaning fires. Only during fire-cleaning periods, however, shall smoke of Ringelmann Number three (3) be permitted, and then for not more than four (4) minutes per period.
The rate of emission of particulate matter from all sources within the boundaries of any lot shall not exceed a net figure of one pound per acre of lot area during any one hour, after deducting from the gross hourly emission per acre the correction factor set forth in the following table:
Allowance for Height of Emission*
Height of Emission Above Grade (feet) | Correction (pounds per hour per acre) |
50 | 0.01 |
100 | 0.06 |
150 | 0.10 |
200 | 0.16 |
300 | 0.30 |
400 | 0.50 |
*Interpolate for intermediate values not shown in table. Determination of the total net rate of emission of particulate matter within the boundaries of any lot shall be made as follows:
1. Determine the maximum emission in pounds per hour from each source of emission and divide this figure by the number of acres of lot area, thereby obtaining the gross hourly rate of emission in pounds per acre.
2. From each gross hourly rate of emission derived in 1. above, deduct the correction factor (interpolating as required) for height of emission set forth in the Table, thereby obtaining the net rate of emission in pounds per acre per hour from each source of emission.
3. Add together the individual net rates of emission derived in 2. above, to obtain the total net rate of emission from all sources of emission within the boundaries of the lot. Such total shall not exceed one pound per acre of lot area during any one hour.