Evergreen Needle Magnetization as a Proxy for Particulate Matter Pollution in Urban Environments.

ABSTRACT: We test the use of magnetic measurements of evergreen needles as a proxy for particulate matter pollution in Salt Lake City, Utah. Measurements of saturation isothermal remanent magnetization indicate needle magnetization increases with increased air pollution. Needle magnetization shows a high degree of spatial variability with the largest increases in magnetization near roadways. Results from our magnetic measurements are corroborated by scanning electron microscopy of needle surfaces and by inductively coupled plasma mass spectrometry of metal concentrations in residues collected from sampled needles. Low-temperature magnetic analysis suggests the presence of small (<20 nm) partially oxidized magnetite particles on needles collected adjacent to a major roadway. Magnetization may be a lo

SUBMITTER: Rea-Downing G 

PROVIDER: S-EPMC7507380 | biostudies-literature | 2020 Sep

REPOSITORIES: biostudies-literature