Articles | Volume 14, issue 6
Atmos. Meas. Tech., 14, 4355–4374, 2021
https://doi.org/10.5194/amt-14-4355-2021
Atmos. Meas. Tech., 14, 4355–4374, 2021
https://doi.org/10.5194/amt-14-4355-2021
Research article
14 Jun 2021
Research article | 14 Jun 2021

Quantifying organic matter and functional groups in particulate matter filter samples from the southeastern United States – Part 2: Spatiotemporal trends

Alexandra J. Boris et al.

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Short summary
Infrared spectrometry can be applied in routine monitoring of atmospheric particles to give comprehensive characterization of the organic material by bond rather than species. Using this technique, the concentrations of particle organic material were found to decrease 2011–2016 in the southeastern US, driven by a decline in highly aged material, concurrent with declining anthropogenic emissions. However, an increase was observed in the fraction of more moderately aged organic matter.