#IndoorAir2022. @CJWeschler. Indoor non-body (inanimate objects) reactions of ozone has a reaction rate constants of about 2.0 h-1. Body reactions about 0.9h-1. Gas phase losses is about 0.1 h-1. So about 1/3 of ozone loss is on-body surfaces. 1/5
"What fraction of ozone removal by off-body surfaces is attributable to reaction with skin oil constituents?" We emit tons of skin flakes daily. Skin oil is distinctive in that is has omega-10 acyl groups (not in cooking oils, etc). These groups result in decanal. 2/5
Hence, decanal is a good tracer for ozone-skin oil reactions. Decanal yield with skin oil is about 5%. Off body yields is about 1%. Roughly 20% of ozone removal by off-body surfaces is attributable to reactions with off-body skin oil. 3/5
Skin oils:
1. Rich in double bonds.
2. Relatively fresh compared to other sources (particles/SVOCs).
3. Soil indoor surfaces (perhaps why ozone deposition velocities are similar across indoor materials) 4/5
1. Rich in double bonds.
2. Relatively fresh compared to other sources (particles/SVOCs).
3. Soil indoor surfaces (perhaps why ozone deposition velocities are similar across indoor materials) 4/5
Skin oil is responsible for 30-40% of ozone loss indoors. Higher with higher human densities. 5/5
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