The maximum exposure time allowed for different noise levels is known as the occupational exposure limits (OELs) for noise. They are frequently shown in exposure-duration tables, such as Tables 1A and 1B. The criteria level and the exchange rate, two crucial variables that are utilized to create exposure-duration tables, have an impact on the OELs. Figure 1A Limits of Noise Exposure when the Criteria Level Is 85 dBA Maximum Permitted Daily Duration 3 dBA Exchange Rate (hours) Allowable Level dBA 5 dBA Exchange Rate Allowable Level dBA 85 8 85 88 4 90 91 2 95 94 1 100 97 0.5 105 100 0.25 110 Figure 1B Noise Exposure Limits at 90 dBA (the criterion level) Maximum Permitted Daily Duration: 3 dBA Exchange Rate (hours) Allowable Level dBA 90 8 90 93 4 95 96 2 100 99 1 105 102 0.5 110 105 0.25 115 Allowable Level dBA 5 dBA Exchange Rate
What level meets the criteria?
The continuous noise level allowed for a whole eight-hour work shift is known as the ""criterion level,"" or Lc for short. In most places, this is 85 dBA, however in Quebec, it is 90 dBA, and for businesses that adhere to Canadian federal noise rules, it is 87 dBA.
Which exchange rate is it?
The permissible exposure duration must be reduced as the sound level rises above the Lc criteria level. Utilizing an exchange rate, also known as a ""dose-trading relation"" or ""trading ratio,"" the permitted maximum exposure duration is determined. The amount by which the allowable sound level may increase if the exposure time is cut in half is known as the exchange rate. There are now two different exchange rates in use: the 3 dBA exchange rate, also known as the ""3 dB rule,"" and the 5 dBA exchange rate, also known as the ""5 dB rule."" As shown in Tables 1A and 1B, these two exchange rates, with criteria levels of 85 dBA and 90 dBA, provide two alternative sets of exposure guidelines. The exchange rate is stricter at 3 dBA. For instance, the 15-minute maximum allowed exposure time for a 100 dBA noise exposure at a 3 dBA exchange rate. It is one hour at the 5 dBA exchange rate. The 3 dB rule is generally acknowledged as being more sensible. They contend that it makes sense to reduce the permitted exposure duration in half if the sound level is doubled. The permitted time should be cut in half for every 3 dBA increase in sound level, as follows. If the 3 dBA exchange rate is applied, then this is exactly the situation. The criteria levels (or maximum allowable exposure levels for 8 hours) and currency rates used in various Canadian provinces are displayed in the table below.
What are the legal limits for exposure to noise in Canada?
Jurisdiction (federal, provincial, territorial) (federal, provincial, territorial) Maximum Permitted Exposure Level for 8 Hours: dB Continuous Noise*1 Impulse/Impact Noise*1 (A) Exchange rate in decibels (A) the highest possible peak pressure level in decibels (peak) Number of Impacts at Maximum Canada (Federal) 87 3 - - British Columbia 85 3 - - Alberta 85 3 - - Saskatchewan4 85 3 - - Manitoba 85 3 - - Ontario 85 34 - - Quebec 90 5 140 100 New Brunswick 85 3 140 - Nova Scotia3 85 3 140 - Prince Edward Island 85 3 - - Newfoundland and Labrador3 85 3 140 - Northwest Territories4 85** *** 140 100 Nunavut4 85** 1. Please refer to Noise - Basic Information for further details on continuous, impulsive, and impact noise. 2. There is typically no separate regulation for impulse/impact noise when the 3 dB exchange rate is employed. As with continuous or intermittent noise, impulsive noise is taken into account while determining the equivalent sound exposure level (Lex). Several governments handle continuous and impulsive noise differently when regulating noise. Limiting the amount of impulses at a specific peak pressure during a workday is a frequent strategy. Although the actual numbers vary slightly, generally speaking, the rules, which use a 5 dB exchange rate, allow for 10,000 impulses at a peak pressure level of 120 dB, 1,000 impulses at 130 dB, 100 impulses at 140 dB, and none above 140 dB. 4. The regulations in these jurisdictions indicate that over an exposure limit of 85 dBA Lex or a ""at any time"" sound level limit of 90 dBA, the employer is required to provide hearing protection, train employees, and implement audiometric testing. 3. The regulations in these jurisdictions do not specify a value but refer to the ACGIH TLVs. The term ""dBA Lex"" refers to the noise level of a worker's overall exposure, averaged over the course of a workday and converted to an equivalent eight-hour exposure. Additionally, unprotected exposure to sound levels higher than 90 dBA is prohibited in these jurisdictions. Employers are required to take protective measures whenever a worker is exposed at any time to sound levels equal to or higher than 90 dBA, even if the equivalent exposure is less than 85 dBA. The Mine Health and Safety Regulations in both jurisdictions make reference to the 3 dBA exchange rate and the 140 dB maximum impulse level. For more information, kindly get in touch with Nunavut and/or the Northwest Territories.
Where in Canadian law are noise exposure limitations found?
The occupational noise exposure limitations from the various Canadian jurisdictions can be found in the following references to federal, provincial, and territorial legislation. The jurisdiction should be contacted for the most recent information regarding the noise exposure limits and how they are enforced because laws are occasionally updated. This material is provided primarily as a general overview and might not be applicable to certain occupational fields (for example, mining). The regulations should also be reviewed for details on the specifications for hearing protection equipment and any further control measures that might be suggested to safeguard workers' hearing. If you have specific inquiries pertaining to your workplace, please get in touch with the local office of the occupational health and safety department for your jurisdiction. Canada (Federal) (Federal) Part II of the Canada Labour Code (R.S.C. 1985, c. L-2) SOR/86-304: Canada Occupational Safety and Health Regulations Paragraph 7.4 (1) (b) Occupational Health and Safety Regulations under the British Columbia Worker's Compensation Act (BC Reg 296/97 as modified) Section 7.2 of the BC Regulation 382/2004 .1] Table 1 of Schedule 3 of the Saskatchewan Occupational Health and Safety Act, 1993; Alberta Occupational Health and Safety Code, 2009 Section 218 [R.R.S. c.0-1.1, r .1] Manitoba Workplace Safety and Health Act [R.S.M. 1987, c. W210] Section 113 (1) of the Occupational Health and Safety Regulations, 1996 Workplace Safety and Health Regulation (Man. Reg. 217/2006) Part 12 Ontario Occupational Health and Safety Act [R.S.O. 1990, c.1] Quebec Act Respecting Occupational Health and Safety [R.S.Q., c.2] Noise (O. Reg. 381/15) .1] Regulation respecting Occupational Health and Safety (O.C.885-2001) Division XV, Sections 130-141 New Brunswick Occupational Health and Safety Act General Regulation (N.B reg. 91-191 as amended) Part V, Sections 29 to 33 Nova Scotia Workplace Health and Safety Regulations N.S. Reg. 52/2013 Part 2, Section 2.1 to 2.3 (references ACGIH TLVs, as updated annually) Prince Edward Island Occupational Health and Safety Act Occupational Health and Safety Act General Regulations (E.C. 180/87) Part 8, Section 8.3 Newfoundland and Labrador Occupational Health and Safety Act Occupational Health and Safety Regulations, 2012 Section 68 (references ACGIH TLV, as updated annually) Northwest Territories Safety Act Occupational Health and Safety Regulations, R-039-2015 Part 8 Noise Control And Hearing Conservation Nunavut Safety Act Occupational Health and Safety Regulations, R-003-2016 Part 8 Noise Control and Hearing Conservation Yukon Territories Occupational Health and Safety Act Occupational Health Regulation (O.I.C. 1986/164) Section 4"""