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The chemicals or substances contained in this revision include all substances for which the National Institute for Occupational Safety and Health (NIOSH) has recommended exposure limits (RELs) and those with permissible exposure limits (PELs) as found in the Occupational Safety and Health Administration (OSHA) General Industry Air Contaminants Standard (.1000).

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Python has six built-in types of sequences, but the most common ones are lists and tuples, which we would see in this tutorial.These abbreviations and codes, which have been designed to permit rapid comprehension by the regular user, are discussed for each column in the following subsections.The chemical name found in the OSHA General Industry Air Contaminants Standard (.1000) is listed in the top left portion of each chemical table.The is updated periodically to reflect new data regarding the toxicity of various substances and any changes in exposure standards or recommendations.The data were collected from a variety of sources, including NIOSH policy documents such as criteria documents and Current Intelligence Bulletins (CIBs), and recognized references in the fields of industrial hygiene, occupational medicine, toxicology, and analytical chemistry.Important thing about a list is that items in a list need not be of the same type.

Creating a list is as simple as putting different comma-separated values between square brackets.

For example − You can update single or multiple elements of lists by giving the slice on the left-hand side of the assignment operator, and you can add to elements in a list with the append() method.

For example − Note − remove() method is discussed in subsequent section.

Current Intelligence Bulletins (CIBs) are issued to disseminate new scientific information about occupational hazards.

A CIB may draw attention to a formerly unrecognized hazard, report new data on a known hazard, or present information on hazard control.

Although these documents are not intended to supplant the more comprehensive criteria documents, they are prepared to assist OSHA and MSHA in the formulation of regulations.