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On the surface it might make sense. However, ultrafines behave very differently from the more familiar particles discussed inParticulate. Gravity is not particularly important to their movement and they might behave more like gas than solid. In addition, the typical methods for measuring particulates (mass concentration and the like) are clearly not useful for ultrafines, and we have yet to figure out whatis useful. So at this point I think it would be better to keep this as a separate article.
On the other hand, this article should either recognize a difference betweenNanoparticle and Ultrafine particle (and such a difference can be articulated) or should be combined with the nanoparticle article.Pzavon (talk)00:53, 23 March 2008 (UTC)[reply]
Because the health effects are sharply worse starting at PM2.5 and working down, an article covering fine particles, ultrafine particles, and nanoparticles would be welcome, separate from but referred to by, the particles article.Ocdnctx (talk)01:44, 16 November 2011 (UTC)[reply]
EPA reassessing current PM2.5 standards in light of new research showing worse for health than though.
Dense fine particles from cars (diesel?) the worst. EPA reassessing current PM2.5 standards.
"… upends previous assumptions about the fate of the byproducts of the pollution from internal-combustion engines. These gaseous byproducts were thought to incorporate themselves into tiny airborne drops of liquid that would then dissipate quickly as the drops evaporated.
The new study finds instead that they attach themselves more tightly to airborne organic particles, creating tiny tar balls that evaporate more slowly and persist longer than anyone had thought. ... "
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Nanoparticles seem to overlap lower end of Ultrafine particle size range, and are better known to and understood by, the public.
Googling, 2017 March 12 over 40 times the hits. Advantage Nanoparticles over Ultrafine particles
Nanoparticles 18,900,000 results
Ultrafine particles 450,000 results
"Particles less than 10 nm are also referred to as nanoparticles"
... particle data were classified to ultrafine particles (number concentration with size between 10 nm and 100 nm, NC0.01–0.1) and nano particles (number concentrations with size between 10 nm and 50 nm, NC0.01–0.05).
... Ultrafine particles are airborne particulates of less than 100 nm in aerodynamic diameter. Examples of ultrafine particles are diesel exhaust particles, products of cooking, heating and wood burning in indoor environments, and more recently, products generated through the use of nanotechnology.
...
... Although there are many differences in the physico-chemical composition of UFPs and nanoparticles, one common feature is their extremely small size; this allows these particles to have unique characteristics that can cause harmful health effects to human subjects (Box 1 and Table II).1
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