Signal words

Signal Words
The words used on a pesticide label--Danger, Warning, Caution--to indicate level of toxicity.
Significant Deterioration ...

signal words The words used on a pesticide label to indicate level of toxicity.
significant deterioration Pollution resulting from a new source in previously "clean" areas. See prevention of significant deterioration.

See also: Climate, Air quality, Acid, Emissions, Organic compound