<unk>  are used to determine risk assessment in public health. Industry is continually synthesizing new chemicals, the regulation of which requires evaluation of the potential danger for human health and the environment. Risk assessment is nowadays considered essential for making these decisions on a scientifically sound basis.<unk>  or defined limits include: *No effect<unk>  (NEC), No Observed Effect<unk>  (NOEC), No-observed-adverse-effect level (NOAEL) *Lowest-observed-adverse-effect level (LOAEL) *Acceptable Operator Exposure Level (AOEL) *ECx (in percent)
Measures of pollutant concentration
Measured environmental concentration
Table of modes of mechanical ventilation
Composition of electronic cigarette aerosol
Infection rate
Index of pesticide articles
Instruments used in medical laboratories
Classification of pneumonia