Wiktionary.org : Text is available under the Creative Commons Attribution-ShareAlike License
Use "ultrafine" in a sentence
"Another 2005 study by researchers at the University of Texas found that when an ozone machine was turned on in the presence of a pine-oil cleaner, it produced "significant increases" in so-called ultrafine particles, a pollutant that is of concern to health experts because of the particles 'ability to penetrate deeply into the lungs."
"They found that emissions of so-called ultrafine particles, which are less than 1/500th width of a human hair, were significantly elevated when compared to background pollution levels."
"The study, published today in the journal Environmental Science and Technology, found that emissions of so-called ultrafine particles were 10 times higher than background levels about"