![]() ![]() ![]() What are the conversion factors for the common major air pollutants?īelow is a table with the conversion factors and the molecular weights of the major air pollutants found to be the most damaging to human health and to the environment based on the formulas above at 25☌ and 1 atm (standard atmospheric pressure): Air PollutantĪn exception to the conversion process is the air pollutant particulate matter (PM 10 and PM 2.5), as it consists of various tiny solid and liquid particles. The same equations above can be used for conversion between mg/m 3 (milligrams per cubic metre) and ppm (parts per million) as well. The number 24.45 in the equation is the volume (litres) of a mole (gram molecular weight) of a gas when the temperature is at 25☌ and the pressure is at 1 atmosphere (1 atm = 1.01325 bar). The formula for conversion between µg/m 3 (micrograms per cubic metre) and ppb (parts per billion) are as follows:Ĭoncentration (µg/m 3 ) = molecular weight x concentration (ppb) ÷ 24.45Ĭoncentration (ppb) = 24.45 x concentration (µg/m 3 ) ÷ molecular weight 1 MCG TO MG HOW TOHow to convert between µg/m 3 – ppb and mg/m 3 – ppm A temperature of 25 degrees Celsius and pressure of 1 atmosphere are what is normally assumed for the conversion factor. This is based on the molecular weight of the chemical, which is different between pollutants, and the atmospheric temperature and pressure. Here you can convert another amount of micrograms to milligrams. Now you know that 100 micrograms equals 0.1 milligrams. 1 milligram (mg.) is equal to 1000 micrograms (mcg.) Melatonin is a hormone, and hormones can bring about opposite effects depending on dose (I learned this is. 1, 1, Aceclofenac 100mg and Paracetamol 325mg Tablets, 10s, 10.00. ![]() However, these concentrations can also be expressed as parts per million (ppm) or parts per billion (ppb) by volume through a conversion factor. To convert 100 micrograms to milligrams, we enter 100 into our formula to get the answer as follows: mcg ÷ 1000 mg. Thus, mg/m 3 represents milligrams (one-thousandth of a gram) per cubic metre of air, while µg/m 3 stands for micrograms (one-millionth of a gram) per cubic metre of air. What does mg/m 3, µg/m 3, ppm, and ppb stand for?Ĭhemical concentrations in the air are typically measured in the mass units of the substance (milligrams, micrograms, nanograms, picograms) per volume of air (cubic metre or cubic feet). But what do these measurement units stand for, exactly? And how can one be converted to the others? Let’s find out. These are used in air quality thresholds and air quality indexes to help provide a baseline for what constitutes as clean air and for people to understand the acceptable level of pollutants in the air they breathe. When it comes to determining the concentration of air pollutants in the atmosphere, the units of measurement one would typically see are either mg/m 3, µg/m 3, ppm, or ppb. ![]()
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