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Air Quality Sensor Help
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Please be positive and constructive with your questions and comments.

Re: Air Quality Sensor Help

by adafruit_support_carter on Mon Dec 02, 2019 2:26 pm

@Dave_Adafruit_2 Please start a new thread for your issue.

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Re: Air Quality Sensor Help

by airhead on Thu Dec 03, 2020 12:09 am

One of the most popular citizen science monitors is the Purple Air monitor (https://www2.purpleair.com/). John Park's Purple Air AQI Display (https://learn.adafruit.com/purple-air-aqi-display) uses data from the national Purple Air network. The Purple Air contains a pair of Plantower 5003 sensors and a BME 280 RH/T sensor. It uses an ESP 8266 to process the data and send it to a cloud server. A lot of data has been gathered across the US and a correction equation has been developed (for more information see https://amt.copernicus.org/preprints/amt-2020-413/) to make the Purple Air more closely match the more expensive regulatory monitors. The correction equation is: PM2.5 = 0.524*PAcf_1 - 0.0852*RH + 5.72, where PAcf_1 is the average of the two PM2.5cf=1 values from the 5003 and RH is the relative humidity measured by the BME280. This year, during fire season in the west, EPA posted the corrected Purple Air data alongside regulatory data on its firemap (https://fire.airnow.gov/) and the website received millions of hits.
So the Plantower 5003 has hit the big time as far as citizen science sensors go, but don't forget to include the RH sensor in your build and consider doubling up on the 5003 so one one sensor can check the other as you take your measurements.

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Re: Air Quality Sensor Help

by kevinjwalters on Thu Dec 31, 2020 12:32 pm

@StanJ There's a version of that distribution graph on https://publiclab.org/wiki/revisions/pm/25895 but it also includes a note about the graph being an "illustrative graph, not real data"

@mutjoymn I'm not sure what you are referring to? How does this relate to AQI?

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Re: Air Quality Sensor Help

by joejoecor on Fri Feb 19, 2021 2:05 pm

I am looking for build a system with an array of air quality sensors that include O2, CO, CO2, PM, SO. NO, VOCs, Ozone, and maybe I missed some. Can anyone help me with building a system with all these measurement capabilities. My academic background is electrical engineering but I have been a carpenter for many many years so support is key:) I am now on the cusp of becoming a licensed patent agent veering away from the carpentry. For starters, what should I use as a main board that will process and display data from this suite of sensors? I like to build whatever I can from Adafruit components because I like what they stand for, making electronics accessible and fun for youth. I realize that some of the sensors I am looking for may have to be purchased elsewhere.

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Re: Air Quality Sensor Help

by kevinjwalters on Fri Apr 30, 2021 6:19 pm

There's an example of a large group of sensors connected with i2c on Adafruit Forums: Errno19 after few minutes running.

I've been using Pimoroni's Enviro+ FeatherWing on a Feather nRF52840 Express for a while. I have one running at the moment with the PMS5003 and another with an SCD-30 for CO2 connected via a breadboard. I wrote a bit of new code to support that. The Rasperry Pi (Zero) version of the Enviro+ might make more sense if you want something with a display that can send data over WiFi.

I've not gone beyond monitoring at my desk. The whole solar power thing for outside use looks fairly involved. I recently saw an announcement that there's been a deployment of Clarity Movement's Node-S in London. Those can run off solar. Their spec sheet has power as 200 mA (sensing), 500 mA (uploading), <1 mA (sleeping) with data sent over 2G/3G/4G. Much more detail on CITRIS Research Exchange, 3/6/2019: Sean Wihera , Clarity (YouTube).

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