7 research outputs found
Continuously optimizing a groundwater remediation system in complex fractured media
Former chemical plant, groundwater monitoring, 3D finite elements numerical model
On the Redox-Activity and Health-Effects of Atmospheric Primary and Secondary Aerosol: Phenomenology
The RHAPS (Redox-Activity And Health-Effects Of Atmospheric Primary And Secondary
Aerosol) project was launched in 2019 with the major objective of identifying specific properties of
the fine atmospheric aerosol from combustion sources that are responsible for toxicological effects
and can be used as new metrics for health-related outdoor pollution studies. In this paper, we present the overall methodology of RHAPS and introduce the phenomenology and the first data observed.
A comprehensive physico-chemical aerosol characterization has been achieved by means of high-time
resolution measurements (e.g., number size distributions, refractory chemical components, elemental
composition) and low-time resolution analyses (e.g., oxidative potential, toxicological assays, chemical
composition). Preliminary results indicate that, at the real atmospheric conditions observed (i.e., daily
PM1 from less than 4 to more than 50 ug m-3), high/low mass concentrations of PM1, as well as black
carbon (BC) and water soluble Oxidative Potential (WSOP,) do not necessarily translate into high/low
toxicity. Notably, these findings were observed during a variety of atmospheric conditions and
aerosol properties and with different toxicological assessments. Findings suggest a higher complexity
in the relations observed between atmospheric aerosol and toxicological endpoints that go beyond
the currently used PM1 metrics. Finally, we provide an outlook to companion papers where data will
be analyzed in more detail, with the focus on source apportionment of PM1 and the role of source
emissions on aerosol toxicity, the OP as a predictive variable for PM1 toxicity, and the related role
of SOA possessing redox-active capacity, exposure-response relationships for PM1, and air quality
models to forecast PM1 toxicity