prov:value
| - Formaldehyde is formed in the troposphere by the photochemical oxidation of many types of organic compounds, including naturally occurring compounds, such as methane (WHO, 1989; U.S. EPA, 1993) and isoprene (Tanner et al., 1994), and pollutants from mobile and stationary sources, such as alkanes, alkenes (e.g., ethene, propene), aldehyde s (e .g., acetaldehyde, acrolein) and alcohols (e.g., allyl
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