For example, after an accidental contamination by a hazardous chemical, the concentration of the chemical is compared to established "action levels" to determine if the foods are fit for human consumption.
(the concentration of the chemical; is compared; to established "action levels; to determine if the foods are fit for human consumption; T:after an accidental contamination by a hazardous chemical)
the concentration of the chemical
is compared
to established "action levels to determine if the foods are fit for human consumption T:after an accidental contamination by a hazardous chemical