2 research outputs found
Size-Resolved Endotoxin and Oxidative Potential of Ambient Particles in Beijing and Zürich
PM<sub>2.5</sub> pollution has become
a global health concern,
however its size-resolved health impact remains to be poorly elucidated.
Here, ambient particulate matter (PM) were collected into 13 different
size ranges (10 nm to 18 μm) and the mass, metal, endotoxin
distributions, and related oxidative potential were investigated in
two regions (Zürich, Switzerland and Beijing, China). Results
showed that the two regions had remarkably different PM distribution
patterns. Swiss urban samples had a mode around 40 nm with 23.3% of
total PM mass, while Chinese samples featured two modes around 0.75
and 4.23 μm with 13.8–18.6% and 13.7–20.4% of
total PM mass, respectively. Two peaks for endotoxin at 40–100
nm and 1–4 μm were observed in different regions. For
PM-borne metals, Chinese samples had 67.6–100% of total Cd,
As, and Pb in the size range of 0.1–1 μm, and Swiss samples
had similar distributions of Cd and Pb but much lower total metals
than Chinese samples. The PM oxidative potential varied greatly with
sizes for different regions. Accordingly, the current practice, i.e.,
sole use of the mass concentration, could lead to inadequate health
protection for one region, but unnecessary economic costs for another
without achieving significant extra health benefits
Size-Resolved Endotoxin and Oxidative Potential of Ambient Particles in Beijing and Zürich
PM<sub>2.5</sub> pollution has become
a global health concern,
however its size-resolved health impact remains to be poorly elucidated.
Here, ambient particulate matter (PM) were collected into 13 different
size ranges (10 nm to 18 μm) and the mass, metal, endotoxin
distributions, and related oxidative potential were investigated in
two regions (Zürich, Switzerland and Beijing, China). Results
showed that the two regions had remarkably different PM distribution
patterns. Swiss urban samples had a mode around 40 nm with 23.3% of
total PM mass, while Chinese samples featured two modes around 0.75
and 4.23 μm with 13.8–18.6% and 13.7–20.4% of
total PM mass, respectively. Two peaks for endotoxin at 40–100
nm and 1–4 μm were observed in different regions. For
PM-borne metals, Chinese samples had 67.6–100% of total Cd,
As, and Pb in the size range of 0.1–1 μm, and Swiss samples
had similar distributions of Cd and Pb but much lower total metals
than Chinese samples. The PM oxidative potential varied greatly with
sizes for different regions. Accordingly, the current practice, i.e.,
sole use of the mass concentration, could lead to inadequate health
protection for one region, but unnecessary economic costs for another
without achieving significant extra health benefits