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Non-Methane Hydrocarbon (NMHC)
The sum of all hydrocarbon air pollutants except methane; significant precursors to ozone formation.
Source: Terms of the Environment ...
Chemical compounds, such as carbon monoxide, methane, non-methane hydrocarbons, and nitrogen oxides, which in the presence of solar radiation react with other chemical compounds to form ozone, mainly in the troposphere.
Palustrine ...
 See also: Air pollutant, Pollutant, Precursor, Ozone, Air
  
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