Industrial Performance Standards
Table of Maximum Permissible Sound-Pressure Levels | ||||
|---|---|---|---|---|
Pre-1960 Octave Bands1 | Preferred Frequency Octave Bands2 | |||
Octave Band Frequency (cycles per second) | Decibels | Octave Band Center Frequency (cycles per second) | Decibels | |
0 to 75 | 72 | 31.5 | 76 | |
75 to 150 | 67 | 63 | 71 | |
150 to 300 | 59 | 125 | 65 | |
300 to 600 | 52 | 250 | 57 | |
600 to 1,200 | 40 | 500 | 50 | |
1,200 to 2,400 | 40 | 1,000 | 45 | |
2,400 to 4,800 | 34 | 2,000 | 39 | |
Above 4,800 | 32 | 4,000 | 34 | |
NOTES: 1 Pre-1960 Octave Bands. A standardized series of octave bands prescribed by the American Standards Association in Z24.10-1953, Octave Band Filter Set for the Analysis of Noise and Other Sounds. | |
2 Preferred Frequency Octave Bands. A standardized series of octave bands prescribed by the American Standards Association in S1.6-1960, Preferred Frequencies for Acoustical Measurements. |
Table of Correction Factors - Sound Pressure Levels | |||
|---|---|---|---|
Type of Operation or Character Noise | Correction in Decibels | ||
Daytime operation 7:00 a.m. to 11:00 p.m. | plus 5 | ||
Noise source operated less than 20% of any one-hour period | plus 5* | ||
Noise source operated less than 5% of any one-hour period | plus 10* | ||
Noise source operated less than 1% of any one-hour period | plus 15* | ||
Noise of impulsive character (hammering, and so forth) | minus 5 | ||
Noise of periodic character (hum, screech, and so forth) | minus 5 | ||
NOTE: | |||
* Apply one of these corrections only. | |||
Photochemical Oxidants: Emission of photochemical oxidants shall not exceed a maximum hourly concentration of 0.04 parts per million, as determined by the Alkaline Potassium Iodine method.1 | |
Hydrocarbons: The three-hour average concentration of hydrocarbons (with correction for methane) shall not exceed 0.15 parts per million, as determined by the Flame Ionization Technique. | |
Carbon Monoxide: The eight-hour average concentration of carbon monoxide shall not exceed three parts per million, and the average concentration shall not exceed 20 parts per million in any ninety-minute period, as determined by continuous Nondispersive Infrared Analyzers. | |
Sulfur Oxides: the twenty-four-hour average concentration of sulfur oxides shall not exceed 0.03 parts per million, and the maximum hourly concentration shall be 0.10 parts per million, as determined by the modified West-Gaeke Method.2 | |
Nitrous Oxides: The annual average concentration of nitrous oxides shall not exceed 0.026 parts per million, as determined by the modified West-Gaeke Method.3 | |
Particulate Matter: The twenty-four-hour average concentration of particulate matter shall not exceed 100 micrograms per cubic meter, as determined by the High Volume Air Sampling Method. |
NOTES: | |
1 All air sampling methods are those described in Air Quality Criteria, U.S. Department of Health, Education and Welfare, unless otherwise specified. | |
2 Scaringelli, S.A.; Saltzman, B.E., Frey, S.A.; 1967. | |
3 Saltzman, B.E. |
Industrial Performance Standards
Table of Maximum Permissible Sound-Pressure Levels | ||||
|---|---|---|---|---|
Pre-1960 Octave Bands1 | Preferred Frequency Octave Bands2 | |||
Octave Band Frequency (cycles per second) | Decibels | Octave Band Center Frequency (cycles per second) | Decibels | |
0 to 75 | 72 | 31.5 | 76 | |
75 to 150 | 67 | 63 | 71 | |
150 to 300 | 59 | 125 | 65 | |
300 to 600 | 52 | 250 | 57 | |
600 to 1,200 | 40 | 500 | 50 | |
1,200 to 2,400 | 40 | 1,000 | 45 | |
2,400 to 4,800 | 34 | 2,000 | 39 | |
Above 4,800 | 32 | 4,000 | 34 | |
NOTES: 1 Pre-1960 Octave Bands. A standardized series of octave bands prescribed by the American Standards Association in Z24.10-1953, Octave Band Filter Set for the Analysis of Noise and Other Sounds. | |
2 Preferred Frequency Octave Bands. A standardized series of octave bands prescribed by the American Standards Association in S1.6-1960, Preferred Frequencies for Acoustical Measurements. |
Table of Correction Factors - Sound Pressure Levels | |||
|---|---|---|---|
Type of Operation or Character Noise | Correction in Decibels | ||
Daytime operation 7:00 a.m. to 11:00 p.m. | plus 5 | ||
Noise source operated less than 20% of any one-hour period | plus 5* | ||
Noise source operated less than 5% of any one-hour period | plus 10* | ||
Noise source operated less than 1% of any one-hour period | plus 15* | ||
Noise of impulsive character (hammering, and so forth) | minus 5 | ||
Noise of periodic character (hum, screech, and so forth) | minus 5 | ||
NOTE: | |||
* Apply one of these corrections only. | |||
Photochemical Oxidants: Emission of photochemical oxidants shall not exceed a maximum hourly concentration of 0.04 parts per million, as determined by the Alkaline Potassium Iodine method.1 | |
Hydrocarbons: The three-hour average concentration of hydrocarbons (with correction for methane) shall not exceed 0.15 parts per million, as determined by the Flame Ionization Technique. | |
Carbon Monoxide: The eight-hour average concentration of carbon monoxide shall not exceed three parts per million, and the average concentration shall not exceed 20 parts per million in any ninety-minute period, as determined by continuous Nondispersive Infrared Analyzers. | |
Sulfur Oxides: the twenty-four-hour average concentration of sulfur oxides shall not exceed 0.03 parts per million, and the maximum hourly concentration shall be 0.10 parts per million, as determined by the modified West-Gaeke Method.2 | |
Nitrous Oxides: The annual average concentration of nitrous oxides shall not exceed 0.026 parts per million, as determined by the modified West-Gaeke Method.3 | |
Particulate Matter: The twenty-four-hour average concentration of particulate matter shall not exceed 100 micrograms per cubic meter, as determined by the High Volume Air Sampling Method. |
NOTES: | |
1 All air sampling methods are those described in Air Quality Criteria, U.S. Department of Health, Education and Welfare, unless otherwise specified. | |
2 Scaringelli, S.A.; Saltzman, B.E., Frey, S.A.; 1967. | |
3 Saltzman, B.E. |