The concentration limit of toxicants in water, fish, and other food commodities that should be avoided. The laws in many countries require that food commodities are seized and drinking water sources c [..]

An 8-hour time-weighted average of 85 decibels measured on the A-scale, slow response, or equivalently, a dose of fifty percent.

Action Level (AL)

(i) The level of a pollutant at which specified emergency countermeasures, such as the seizure and destruction of contaminated materials, evacuation of the local population or closing down the sources [..]

A guideline established by environmental protection agencies to identify the concentration of a substance in a particular medium (water, soil, etc.) that may present a health risk when exceeded. If contaminants are found at concentrations above their action levels, measures must be taken to decrease the contamination.

The concentration of lead or copper in water which determines the treatment requirements that a water system is required to complete.

The limit for a contaminant established by the Food and Drug Administration (or other regulatory body) where action may be taken against a product to remove it from the market or to otherwise ensure t [..]

The concentration of a contaminant above which some action (monitoring, clean up, etc.) is required by regulation.

The level of chemical which, if exceeded, triggers treatment or other requirements that a water system must follow.

A guideline established by environmental protection agencies to identify the concentration of a substance in a particular medium (water, soil, etc.) that may present a health risk when exceeded. If co [..]