No Observable Adverse Effect Level (NOAEL): An exposure level at which there are no statistically or biologically significant increases in the frequency or severity of adverse effects between the exposed population and its appropriate control; ...
Structureless - no observable aggregation or no definite orderly arrangement around natural lines of weakness.
A.
Single grain - loose, incoherent mass of individual particles as in sands.
For a given ecological effects test, the range (or geometric mean) between the No Observable Adverse Effect Level and the Lowest Observable Adverse Effects Level.
Maximum Available Control Technology (MACT) ...
No Observable Adverse Effect Level (NOAEL)
No Till
Noble Metal
Noise
Non-Binding Allocations of Responsibility (NBAR)
Non-ionizing Electromagnetic Radiation
Non-Aqueous Phase Liquid (NAIL)
Non-Attainment Area
Non-Community Water System ...
Maximum Acceptable Toxic Concentration: For a given ecological effects test, the range (or geometric mean) between the No Observable Adverse Effect Level and the Lowest Observable Adverse Effects Level.
 See also: Environmental, Community, Structure, Air, Treatment
  
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