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I would recommend checking out the AQ-SPEC program [1]. They do quite comprehensive tests on low-cost air quality sensors. My side project with a few friends [

by pppone 4y ago

I would recommend checking out the AQ-SPEC program [1]. They do quite comprehensive tests on low-cost air quality sensors. My side project with a few friends [2] chose to use the Sensirion SPS30 [3] for our portable PM2.5 monitor. As mentioned by others, it's a bit more expensive than the PMS5003 used by AirGradient, but we preferred its documentation, company reputation, and form factor at the time of choosing (2019). The PMS5003 is perfectly capable, and has demonstrated good success with many projects/companies using the sensor (e.g. PurpleAir). However, a quick search suggests there are some issues with a recent batch of these sensors [4]. [1]: https://www.aqmd.gov/aq-spec/sensors https://www.aqmd.gov/aq-spec/sensors [2]: https://www.open-seneca.org/ https://www.open-seneca.org/ [3]: https://sensirion.com/products/catalog/SPS30/ https://sensirion.com/products/catalog/SPS30/ [4]: https://community.purpleair.com/t/new-version-of-plantower-pms5003/288 https://community.purpleair.com/t/new-version-of-plantower-p...

newman314 4y ago
Your site does not appear to have pricing for your kit based on brief browsing.
- chubbnix 4y ago
  They are about $50 from my search which is about 5x more than the plantower pm2.5 sensors. There is a big difference in documentation and that issue with the new MCU on the plantower units is concerning since they all have the same markings and housing when purchased.
  - pppone 4y ago
    At volume, the SPS30 gets down to ~$30 a piece. Their newest sensors (SEN5X) offer similar specs, and are about $25 per single unit, or $15 a piece at volume for the cheapest variant. The more expensive variant include integrated T/RH monitoring, which is very handy for humidity corrections for this type of PM2.5 sensing.
- pppone 4y ago
  Sadly not yet. Since this is more of a voluntary commitment amongst my friends and I (we're in the process of finishing our PhDs), we lack the human-power to take the product to market at the moment.
NathanielK 4y ago
That program is excellent! I purchased an AtmotubePro for PM2.5 measuring, and their testing and confirming it uses and SP30 makes me much more confident in it's readings.
- belter 4y ago
  It's a shame its does not seem to do CO2 only a compound measure of VOC gases. It seems only the Atmo Cube has CO2 measures.
deleted 4y ago
[deleted]
kayson 4y ago
Ooof based on the aq-spec summaries... None of the gas sensors are particularly good. And the best ones are thousands of dollars..
rkagerer 4y ago
This resource is amazing. I bought a Dylos DC1700-PM a while back for around $400; interesting to see how the lab test shows it producing varying data at 65%+ humidity (I live in a fairly humid climate and that perhaps contributes to why I see large shifts in readings throughout the day). Is there a good, sub-$3000 meter that is accurate, 'just works', and requires little to no maintenance?

by pppone 4y ago

newman314 4y ago

Your site does not appear to have pricing for your kit based on brief browsing.

chubbnix 4y ago
They are about $50 from my search which is about 5x more than the plantower pm2.5 sensors. There is a big difference in documentation and that issue with the new MCU on the plantower units is concerning since they all have the same markings and housing when purchased.
- pppone 4y ago
  At volume, the SPS30 gets down to ~$30 a piece. Their newest sensors (SEN5X) offer similar specs, and are about $25 per single unit, or $15 a piece at volume for the cheapest variant. The more expensive variant include integrated T/RH monitoring, which is very handy for humidity corrections for this type of PM2.5 sensing.
pppone 4y ago
Sadly not yet. Since this is more of a voluntary commitment amongst my friends and I (we're in the process of finishing our PhDs), we lack the human-power to take the product to market at the moment.

NathanielK 4y ago

That program is excellent! I purchased an AtmotubePro for PM2.5 measuring, and their testing and confirming it uses and SP30 makes me much more confident in it's readings.

belter 4y ago
It's a shame its does not seem to do CO2 only a compound measure of VOC gases. It seems only the Atmo Cube has CO2 measures.

deleted 4y ago

[deleted]

kayson 4y ago

Ooof based on the aq-spec summaries... None of the gas sensors are particularly good. And the best ones are thousands of dollars..

rkagerer 4y ago

This resource is amazing. I bought a Dylos DC1700-PM a while back for around $400; interesting to see how the lab test shows it producing varying data at 65%+ humidity (I live in a fairly humid climate and that perhaps contributes to why I see large shifts in readings throughout the day). Is there a good, sub-$3000 meter that is accurate, 'just works', and requires little to no maintenance?