emissions from the spill consisted of HCs evaporating from oil.
These HCs can affect air quality in three ways. First, some of the
measured compounds, including benzene, toluene, and naphthalene,
are classified as hazardous air pollutants (http://www.epa.
gov/ttn/atw/orig189.html, http://www.epa.gov/ttn/atw/pollutants/
atwsmod.html). Second, evaporating HCs, especially intermediate
volatility organic compounds (IVOCs) with vapor pressures
comparable to C14-C16 alkanes, reacted in the atmosphere to
produce lower volatility products that then form SOA (4). Third,
the HCs reacted with NOx and sunlight to form secondary pollutants
such as ozone and PAN.