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WBGT Wet Bulb Globe Temperature
WDR Waste Discharge Requirements
WEEL Workplace Environmental Exposure Limit
WHMIS Workplace Hazardous Materials Information System This is a program is legislated by the Canadian government, which requires, among other things, the creation and availability of material safety data sheets. However, in several of the Canadian Provinces, many functions associated with Federal OSHA in the US are controlled instead at a Provincial level
WHO World Health Organization
WPS Worker Protection Standard - pesticide safety - Part 170 of Subchapter E, Chapter I of Title 40 CFR) (PDF format from EPA)
WQA Water Quality Act of 1987 (Federal, FWPCA)
WSO World Safety Organization
WWTP Wastewater Treatment Plant