How can I find the MPL (Maximum Permissible Limit) for a specific substance or parameter?

To find the Maximum Permissible Limit (MPL) for a specific substance or parameter, you can refer to regulatory guidelines set by government agencies or organizations such as the Environmental Protection Agency (EPA) or the World Health Organization (WHO). These guidelines outline the safe levels of exposure to various substances and parameters to protect human health and the environment. You can also consult scientific literature, research studies, or experts in the field for more information on determining MPLs.