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<p class="MsoNormal"><span style="font-size:11.0pt">Khare, Peeyush, Machesky, Jo, Williams, Leah, Humes, Mackenzie, Fortner, Edward C., Canagaratna, Manjula, Krechmer, Jordan E., Lambe, Andrew T., Presto, Albert A., and Gentner, Drew R. Chemical Composition
of Fresh and Aged Asphalt-Related Organic Aerosols: From Ambient Observations to Laboratory Experiments, ACS ES&T Air, <a href="https://doi.org/10.1021/acsestair.4c00193" target="_blank">https://doi.org/10.1021/acsestair.4c00193</a>, 2025. <o:p></o:p></span></p>
<p class="MsoNormal"><span style="font-size:11.0pt"><o:p> </o:p></span></p>
<p class="MsoNormal"><b><span style="font-size:11.0pt">Abstract</span></b><span style="font-size:11.0pt">. Asphalt-related emissions are an understudied source of reactive organic compounds with the potential to form organic aerosol (OA). Ambient aerosol mass
spectrometry (AMS) measurements of asphalt-related aerosols near a month-long road paving project showed enhanced ambient OA concentrations with a mix of primary and secondary OA signatures. For comparison, gas-phase emissions from real-world road asphalt
samples at application (e.g., 140 °C) and in-use (e.g., 60 °C) temperatures were injected into an environmental chamber and an oxidation flow reactor to simulate varying degrees of oxidative aging while measuring their gas- and aerosol-phase oxidation products.
Secondary OA formation was observed via both self-nucleation and condensation, with chemical properties dependent on asphalt temperature and reaction conditions. The chemical composition of less-aged asphalt-related OA observed in outdoor and laboratory measurements
was similar to OA from other petrochemical-based sources and hydrocarbon-like OA source factors observed via AMS in previous urban studies. The composition of aged OA varied with the degree of oxidation, similar to oxidized OA factors observed in ambient air.
Taken together, these field and laboratory observations suggest that contributions to urban OA during and after application may be challenging to deconvolve from other traditional sources in ambient measurements.<o:p></o:p></span></p>
<p class="MsoNormal"><span style="font-size:11.0pt"><o:p> </o:p></span></p>
<p class="MsoNormal"><span style="font-size:11.0pt"><a href="https://sites.google.com/site/pamwiki/publications-using-the-pam-oxidation-flow-reactor?authuser=0">PAM Wiki - Publications Using the PAM Oxidation Flow Reactor</a><o:p></o:p></span></p>
<p class="MsoNormal"><span style="font-size:11.0pt"><o:p> </o:p></span></p>
<p class="MsoNormal"><span style="font-size:11.0pt;mso-ligatures:none">Andrew Lambe<o:p></o:p></span></p>
<p class="MsoNormal"><span style="font-size:11.0pt;mso-ligatures:none">Principal Scientist<o:p></o:p></span></p>
<p class="MsoNormal"><span style="font-size:11.0pt;mso-ligatures:none">Aerodyne Research, Inc.
<o:p></o:p></span></p>
<p class="MsoNormal"><o:p> </o:p></p>
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