Wildfire Smoke Contributions to Polycyclic Aromatic Hydrocarbon Loadings in Western Canadian Urban Surface Grime.

Wildfires emit large amounts of polycyclic aromatic hydrocarbons (PAHs) into the atmosphere. As PAHs emitted from anthropogenic sources are known to accumulate in urban surface grime present on building exteriors and windows, we hypothesized that PAH-containing wildfire smoke plumes could similarly increase PAH grime loadings. To explore this hypothesis, we coupled analysis of PAHs in grime samples collected from August to November 2021 in two historically smoke-affected Canadian cities, Calgary and Kamloops, with contemporaneous field- and model-based indicators of wildfire influence.

Avoiding Regrettable Replacements: Can the Introduction of Novel Functional Groups Move PFAS from Recalcitrant to Reactive?

Per- and polyfluoroalkyl substances (PFASs) are present in a range of commercial and consumer products. These chemicals are often high-performance surfactants or nonstick/water-repellant coatings due to their chemical stability; however, this stability leads to select PFAS being environmentally persistent. To facilitate degradation, new fluorosurfactant building blocks (FC-O-CHF-CF-S-CH-CH-OH (FESOH), FC-O-CHF-CF-S-CH-CH-OH (MeFESOH), FC-O-CHF-CF-O-CH-CH-OH (ProFdiEOH), FC-O-CHF-CF-CH-OH (ProFEOH), and FC-O-CHF-CF-O-CH-CH-OH (MeFdiEOH)) have been systematically developed with heteroatom linkages such as ethers, thioethers, and polyfluorinated carbons.

Correction: Iodine emission from the reactive uptake of ozone to simulated seawater.

Correction for 'Iodine emission from the reactive uptake of ozone to simulated seawater' by Stephanie R. Schneider , , 2023, , 254-263, https://doi.org/10.

Iodine emission from the reactive uptake of ozone to simulated seawater.

The heterogeneous reaction of ozone and iodide is both an important source of atmospheric iodine and dry deposition pathway of ozone in marine environments. While the iodine generated from this reaction is primarily in the form of HOI and I, there is also evidence of volatile organoiodide compound emissions in the presence of organics without biological activity occuring [M. Martino, G.

Air Quality Data Approach for Defining Wildfire Influence: Impacts on PM, NO, CO, and O in Western Canadian Cities.

As the climate warms, it is recognized that wildfires are increasing in size and frequency. The negative effects of wildfires on air quality are well documented, especially on commonly monitored atmospheric pollutants such as PM, NO, CO, and O. However, it is not clear how frequently wildfires influence urban air quality and the size of that influence relative to traffic and industrial pollutants.

Reactive Uptake of Ozone to Simulated Seawater: Evidence for Iodide Depletion.

The reaction of ozone with iodide in the ocean is a major ozone dry deposition pathway, as well as an important source of reactive iodine to the marine troposphere. Few prior laboratory experiments have been conducted with environmentally relevant ozone mixing ratios and iodide concentrations, leading to uncertainties in the rate of the reaction under marine boundary layer conditions. As well, there remains disagreement in the literature assessment of the relative contributions of an interfacial reaction via ozone adsorbed to the ocean surface versus a bulk reaction with dissolved ozone.