This computer-based tool allows users to calculate the adjusted average exposure value (AAEV) based on unusual work schedules. The AAEV is calculated from the TWA as defined in the Québec Regulation Respecting Occupational Health and Safety Health. The adjustment principles are described in the Guide to the Adjustment of Permissible Exposure Values (PEVs) For Unusual Work Schedules (document T-22). It should be noted that, according to these principles, only the TWA should be adjusted. Simple asphyxiants and regulated substances with ceiling values, short-term exposure values or no permissible exposure values are not affected by the adjustment process. However, an adjustment category is also available for these substances to allow users to adapt the adjustment principles to their own limit value system.
Interactive Correction : Web version
Access the tool 
Interactive Correction : The Downloadable Version
To download the Excel file
NOTICE: this file contains macros
On opening the file, you must absolutely:
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Save the file in your computer, and then close it.
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Open the Excel file that you have just saved.
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Turn on the macros macros to allow the utility to work.
The file doesn't seem to work?
Follow the steps below or open this link to see how to change the security level for macros in Excel (In French only)
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The security/macros option for EXCEL parameters has deactivated them. You must modify the security/macros level.
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Select the TOOLS menu, MACROS sub-menu, and the SECURITY sub-sub-menu and choose one of the following options: MEDIUM level or LOW level.
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This change will take effect only after you have closed and restarted the Excel software.
* If you use Excel 2007, please follow the instructions on this link
