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I'm unable to find good sources to make myself an AQI(Air quality Index) measuring device. All I was able to find was the way it is calculated in different regions. But I need some help with the technology used to measure the concentrations of different pollutants like SO2, NOx, PM10, PM2.5, etc.

Are there any good papers or patents on the technology used to measure the AQI?

Any help is appreciated. Thanks.

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The AQI calculation does not require that all pollutants be measured. Instead, it uses the pollutants that are available and then uses a function (chosen by the overarching regulatory agency) that equates health risk categories to the pollutant concentrations. The pollutant with the highest health risk (at present concentrations) will effectively determine the corresponding AQI. See here for how the USA EPA computes their AQI.

In order to detect the most commonly monitored pollutants, you would need an ozone analyzer and a PM2.5 monitor. This is quite expensive. A good single-pollutant monitor will cost thousands of dollars to purchase and many continuing costs. You will also need calibration equipment and standards. Depending on what AQI network you will be using as a reference, the model of instrument that you use will have to meet certain specifications in order for the data to be valid. Teledyne is an example of a company that makes equipment that would meet the qualifications for the USA AirNOW network. You may also find of interest their nice AQI calculator.

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    $\begingroup$ Thanks, but the I wanted to know about the technology like sensors and stuff. Not the info on calculating AQI or existing products. $\endgroup$ – caffeinator13 Dec 27 '16 at 16:18
  • $\begingroup$ I think you are missing the point. Sensors don't measure the AQI. $\endgroup$ – farrenthorpe Dec 27 '16 at 16:51
  • $\begingroup$ I know how to calculate the AQI, I mentioned that in the question. I need the data from the air which can be measured by sensors which in turn are used to calculate the AQI. Am I clear? $\endgroup$ – caffeinator13 Dec 27 '16 at 16:59
  • $\begingroup$ Yes I saw you edited your question. Did you look at the Teledyne link in the answer? $\endgroup$ – farrenthorpe Dec 27 '16 at 17:19
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    $\begingroup$ Perhaps you should research what type of sensor (that actually exists) you would like to make. Then you could form a question that is answerable to your liking. $\endgroup$ – farrenthorpe Dec 27 '16 at 17:32

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