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  2. Useful conversions and formulas for air dispersion modeling

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

    A normal cubic meter (Nm 3) is the metric expression of gas volume at standard conditions and it is usually (but not always) defined as being measured at 0 °C and 1 atmosphere of pressure. A standard cubic foot (scf) is the USA expression of gas volume at standard conditions and it is often ( but not always ) defined as being measured at 60 ...

  3. Air pollutant concentrations - Wikipedia

    en.wikipedia.org/wiki/Air_pollutant_concentrations

    Some express the concentrations as ppmv (parts per million by volume) and some express the concentrations as mg/m 3 (milligrams per cubic meter), while others require adjusting or correcting the concentrations to reference conditions of moisture content, oxygen content or carbon dioxide content.

  4. Threshold limit value - Wikipedia

    en.wikipedia.org/wiki/Threshold_limit_value

    Its units are in parts per million (ppm) for gases and in milligrams per cubic meter (mg/m 3) for particulates such as dust, smoke and mist. The basic formula for converting between ppm and mg/m 3 for gases is ppm = (mg/m^3) * 24.45 / molecular weight. This formula is not applicable to airborne particles.

  5. Permissible exposure limit - Wikipedia

    en.wikipedia.org/wiki/Permissible_exposure_limit

    Chemical regulation is sometimes [clarification needed] expressed in parts per million (ppm), but often [clarification needed] in milligrams per cubic meter (mg/m 3). [2] Units of measure for physical agents such as noise are specific to the agent.

  6. Immediately dangerous to life or health - Wikipedia

    en.wikipedia.org/wiki/Immediately_dangerous_to...

    mg/m 3 ppm 7782-50-5: 0126: Chlorine: 29 mg/m 3: 10 ppm: 7782505: 100-44-7: 0016: Benzyl chloride (used in chemical weapons) [6] 51.8 mg/m 3: 10 ppm: 100447: 77-78-1: 0148: Dimethyl sulfate (used in chemical weapons) [7] 36.1 mg/m 3: 7 ppm: 77781, carcinogenic substance 76-06-2: 0750: Chloropicrin: 13.44 mg/m 3: 2 ppm: 76062: 75-44-5: 0007 ...

  7. Small business owners must report by end of the year to avoid ...

    www.aol.com/small-business-owners-must-report...

    Small business owners face severe penalties if they don't report to the federal government by year's end. Thousands of businesses may not realize they are subject to a new reporting process ...

  8. Parts-per notation - Wikipedia

    en.wikipedia.org/wiki/Parts-per_notation

    At 1 ppm the solution is a very pale yellow. As the concentration increases the colour becomes a more vibrant yellow, then orange, with the final 10,000 ppm a deep red colour. In science and engineering , the parts-per notation is a set of pseudo-units to describe small values of miscellaneous dimensionless quantities , e.g. mole fraction or ...

  9. Spending the holiday season alone this year? How to make the ...

    www.aol.com/spending-christmas-alone-most...

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