4 ms·

> Nanoparticles are particles between 1 and 100 nanometers in size. https://en.wikipedia.org/wiki/Nanoparticle https://en.wikipedia.org/wiki/Nanoparticle

toufka 10y ago
So where exactly then do 'nanoparticles' fall on the PM exposure list then? The standard measurements separate 'small' (<2.5 micron) particulate from 'big' (<10 micron) particulate. 'Small' things entirely subsume the nanoparticle definition. PM2.5 exposure is exposure to particles with their largest length being less than 2500 nanometers. The link says PM2.5 include, "combustion particles, organic compounds, metals, etc." - wherein those classes of particulate indisputably qualify as nanoparticles. If you want to be really pedantic, we could instead say that PM2.5 include 'nanoparticles, clumps of nanoparticles, irregularly shaped nanoparticles, and fine particles'. But I suspect most people do not have common mental distinction between a 'fine' particle and a 'nanoparticle', even though they are (physiologically) more similar to each other in most regards than they are to larger, visible particles, hence the difference in measuring both PM10 and PM2.5 atmospheric particulate [1]. Regardless, the article is talking about a huge amount of pollution, indistinguishable from 'nanoparticles' at the point of measurement, that have caused health problems for a truly massive number of humans. [1] https://en.wikipedia.org/wiki/Particulates#Size.2C_shape_and_solubility_matter https://en.wikipedia.org/wiki/Particulates#Size.2C_shape_and... > Similarly, so called fine PM, (often referred to as PM2.5), tend to penetrate into the gas exchange regions of the lung (alveolus), and very small particles (< 100 nanometers) may pass through the lungs to affect other organs. > The smallest particles, less than 100 nanometers (nanoparticles), may be even more damaging to the cardiovascular system. Nanoparticles can pass through cell membranes and migrate into other organs, including the brain. Particles emitted from modern diesel engines (commonly referred to as Diesel Particulate Matter, or DPM) are typically in the size range of 100 nanometers (0.1 micrometer). These soot particles also carry carcinogens like benzopyrenes adsorbed on their surface.
- the8472 10y ago
  subsumes ≠ AKA

toufka 10y ago

So where exactly then do 'nanoparticles' fall on the PM exposure list then? The standard measurements separate 'small' (<2.5 micron) particulate from 'big' (<10 micron) particulate. 'Small' things entirely subsume the nanoparticle definition. PM2.5 exposure is exposure to particles with their largest length being less than 2500 nanometers. The link says PM2.5 include, "combustion particles, organic compounds, metals, etc." - wherein those classes of particulate indisputably qualify as nanoparticles. If you want to be really pedantic, we could instead say that PM2.5 include 'nanoparticles, clumps of nanoparticles, irregularly shaped nanoparticles, and fine particles'. But I suspect most people do not have common mental distinction between a 'fine' particle and a 'nanoparticle', even though they are (physiologically) more similar to each other in most regards than they are to larger, visible particles, hence the difference in measuring both PM10 and PM2.5 atmospheric particulate [1]. Regardless, the article is talking about a huge amount of pollution, indistinguishable from 'nanoparticles' at the point of measurement, that have caused health problems for a truly massive number of humans. [1] https://en.wikipedia.org/wiki/Particulates#Size.2C_shape_and_solubility_matter https://en.wikipedia.org/wiki/Particulates#Size.2C_shape_and... > Similarly, so called fine PM, (often referred to as PM2.5), tend to penetrate into the gas exchange regions of the lung (alveolus), and very small particles (< 100 nanometers) may pass through the lungs to affect other organs. > The smallest particles, less than 100 nanometers (nanoparticles), may be even more damaging to the cardiovascular system. Nanoparticles can pass through cell membranes and migrate into other organs, including the brain. Particles emitted from modern diesel engines (commonly referred to as Diesel Particulate Matter, or DPM) are typically in the size range of 100 nanometers (0.1 micrometer). These soot particles also carry carcinogens like benzopyrenes adsorbed on their surface.

the8472 10y ago
subsumes ≠ AKA