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  1. Unit Conversion. There are two systems of unit in common use for gaseous and particular pollutants: Mass per unit volume: usually µg -3. The mass of pollutant is expressed as a ratio to the volume of air.

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  2. This is a converter for units used in the field of air pollution. Usage: At first choose the pollutant from the pull-down-menu. You may choose O 3, NO 2, NO, SO 2, CO, CO 2, or H 2 O.

  3. Air pollutants are measured in various units. Find out about the units and how to convert them so you can compare our data with data from other sources.

  4. Select the pollutant for which you want to convert the concentration into AQI. Enter the pollutant concentration. (unit in -) AQI: -. -. Sensitive Groups: -. Health Effects Statements: -. Cautionary Statements: -. PM 2.5 AQI scale: Concentration to AQI.

  5. 6 wrz 2015 · As an example, for gaseous pollutant O 3 (ozone), to convert 20 ppmv of Ozone to `mg/m3 at 25 °C` and 1 atmosphere, the following formula is used: $$ c(20 ppmv) = { 20 \times 12.187 \times 48 \over 273.15 + 25 } = {20 \times 1.97} = 39.4 mg/m^3$$

  6. 22 maj 2015 · Atmospheric Chemistry Cheat Sheet. Version: 1.29 Last Update: 22 May 2015. Compiled by J.L. Jimenez, CU Boulder shortcut to this page: http://tinyurl.com/ac cheat. pu. 1. Key Conversions and Parameters. Conversions between mixing ratios and molec cm 3.

  7. Answer: Apply (1.6) to obtain the number density of air na. Use International System (SI) units at all times in numerical calculations to ensure consistency: After you obtain the result for na in SI units, you can convert it to the more commonly used unit of molecules cm-3: n a = 2.69x10 19 molecules cm-3. The air

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