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  2. Useful conversions and formulas for air dispersion modeling

    en.wikipedia.org/wiki/Useful_conversions_and...

    Although ppmv and grains per dscf have been used in the above examples, concentrations such as ppbv (i.e., parts per billion by volume), volume percent, grams per dscm and many others may also be used. 1 percent by volume = 10,000 ppmv (i.e., parts per million by volume).

  3. Air pollutant concentrations - Wikipedia

    en.wikipedia.org/wiki/Air_pollutant_concentrations

    Although ppmv and mg/m 3 have been used for the examples in all of the following sections, concentrations such as ppbv (i.e., parts per billion by volume), volume percent, mole percent and many others may also be used for gaseous pollutants.

  4. Parts-per notation - Wikipedia

    en.wikipedia.org/wiki/Parts-per_notation

    For volume fraction, the suffix "V" or "v" is sometimes appended to the parts-per notation (e.g. ppmV, ppbv, pptv). [ 8 ] [ 9 ] However, ppbv and pptv are usually used to mean mole fractions – "volume fraction" would literally mean what volume of a pure substance is included in a given volume of a mixture, and this is rarely used except in ...

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    We adhere to strict standards of editorial integrity to help you make decisions with confidence. Some or all links contained within this article are paid links.

  7. Congo says mysterious disease killing dozens of kids finally ...

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    At least 592 cases were reported after the alert was first raised by Congo's health ministry on Oct. 29. The ministry said the disease had a fatality rate of 6.25%.

  8. How to Survive Puppy Teething, According to an Expert Trainer

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    4. Use a Long Tug Toy. A long tug toy may also come in handy, as it encourages the puppy to play with us without involving our bodies. A long tug toy works best because it creates distance between ...

  9. List of least-polluted cities by particulate matter concentration

    en.wikipedia.org/wiki/List_of_least-polluted...

    Rank Country / Region City Average PM2.5 (ug/m3) 1 Switzerland Zürich: 0.49 2 Australia Perth: 1.61 3 South Africa Richards Bay: 2.38 4 Australia Hobart: 2.66 5 Iceland Reykjavík: 3.38