ahaucnx

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361.
by ahaucnx 4y ago
We do offer a pre-soldered kit that can be built very easily within a few minutes. Details on: https://www.airgradient.com/open-airgradient/kits/
362.
by ahaucnx 4y ago
It's open source and additional pins are broken out on the PCB so you can easily add additional sensors yourself.
363.
by ahaucnx 4y ago
1. Yes. No soldering required. Just put it on the socket on the presoldered board. 2. Just buy the presoldered kit and SGP41 module together (put both items into the shopping cart). 3. Yes. The software will already show the TVOC and NOx va
364.
by ahaucnx 4y ago
Shameless plug. If you prefer an open source / open hardware air quality monitor check out our popular DIY air quality monitor [1]. The built uses high quality sensors for PM, CO2, Temperature and Humidity. You can either build it your
365.
by ahaucnx 4y ago
Good choice with the PMS5003 which is in our experience one of the best sensors from Plantower. It is bigger than the PMS7003 or PMSA003 but in our experience more accurate and has a longer life span. A few things you can consider in the fo
366.
by ahaucnx 4y ago
The article gives a good overview of why ventilation and filtration is important but in my opinion misses on the importance of monitoring. At AirGradient we do monitor thousands of indoor spaces and we do see very different patterns of indo
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Show HN: Open Hardware Outdoor Air Quality Monitor(airgradient.com)
1 points by ahaucnx 4y ago|0 comments
368.
by ahaucnx 4y ago
Yes, it is indeed amazing how fast CO2 levels can increase. This is especially a problem in low-ventilated classrooms. At AirGradient we measure a lot of classrooms and it is not uncommon to see CO2 levels rising to above 4500ppm just withi
369.
by ahaucnx 4y ago
I retrovitted the bedrooms (and living room) in my house with a demand controlled fresh air system that contains high quality HEPA and carbon filters. The difference is extremely noticable. Especially when the air quality outside is not goo
370.
by ahaucnx 4y ago
We use the MZ, SCD as well as Senseair S8 and in my opinion all of them give a good enough accuracy. The build quality of the S8 and SCD is a lot better though. The most important thing is to stay away from eCO2 (estimated CO2) that some TV
371.
by ahaucnx 4y ago
We provide a commercial and a popular open-hardware air quality monitor [1] that includes CO2 as well as PM 2.5, VOCs, NOx, humidity and temperature. I am talking everyday with people around the world about why they want to measure air qual
372.
by ahaucnx 4y ago
The fan in the Plantower PMS5003 monitor we use is actually very silent and you can hear it only if you put your ear directly at the sensor. I have a few of our monitors in the bedroom less than 1m away from my ears and I cannot hear them a
373.
by ahaucnx 4y ago
We tested a lot of VOC sensor modules and the estimated CO2 values they give is -in our experience- 80% of the time totally wrong. Also the absolute ppb values of the TVOC are most often not to be trusted. What they are good at is detecting
374.
by ahaucnx 4y ago
We are maintaining a popular open source / open hardware air quality kit that is also available as a pre-soldered version [1]. It incorporates many of the features of our commercial monitor, e.g. high quality and accurate sensor compon
375.
238,000 early deaths from fine particles in the EU(eea.europa.eu)
5 points by ahaucnx 4y ago|0 comments
376.
by ahaucnx 4y ago
We offer air quality monitoring solutions and I talk to customers and people interested in air quality monitoring every day from many different countries. What I see is a very different knowledge on air pollution. For example there is a pre
377.
by ahaucnx 4y ago
I am working with a lot of organisations to increase awareness on air pollution -especially among students. The images of the dark lymph nodes by age remind me of the shocking images of lungs of smokers printed -by law- on cigarette boxes i
378.
by ahaucnx 4y ago
I do not own an Air Quality Egg or an Aranet so I cannot really comment on both. In general most of the low cost monitors use similar sensor modules, e.g. Plantower for PM, Sensirion for TVOCs etc. What is important to ensure that the CO2 s
379.
by ahaucnx 4y ago
You might be interested to join the SAMHE project in the UK [1] (that we are part of). It gives free air quality monitors to secondary schools for a large scientific study. [1] https://www.samhe.org.uk/
380.
by ahaucnx 4y ago
We do indoor air quality monitoring and see very different results across buildings. The biggest differentiator is if the building has mechanical ventilation and to what extent this mechanical ventilation uses fresh air vs internal circulat
381.
by ahaucnx 4y ago
Yes the ABC is often an issue and can lead to an underestimation of the CO2 values. This often happens in non ventilated and relatively air tight rooms. We collect air quality data from many schools and see this happening in some classrooms
382.
by ahaucnx 4y ago
What was your experience with the DIY monitor that you build? I am asking because we maintain an open source / open hardware indoor air quality project [1] that we continuously update and I am interested to learn about missing features
383.
by ahaucnx 4y ago
From our experience normal temperature fluctuations do not impact the accuracy. However many NDIR sensors do not like vibrations and get inaccurate after being moved around. Then you need to wait for the automatic baseline calibration to ki
384.
by ahaucnx 4y ago
I have been to Delhi many times in my previous jobs. On one occasion one of my colleagues got massive breathing problems and needed hospitalization and oxygen. On really bad days cleaning your nose turned the tissue black. Air purifiers are
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Questions and Answers on New EU Air Quality Rules(ec.europa.eu)
2 points by ahaucnx 4y ago|0 comments
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by ahaucnx 4y ago
Thanks for clarifying. Yes, we believe we have PMF and I wanted to illustrate with an example that we did not have any issues with 'finding' it because we had the problem to solve - even before we decided that this could be a prod
387.
by ahaucnx 4y ago
I would really like to understand your comment but I am not sure what you mean with "orthogonal" in this context. Could you please explain more? Our customer which was the school having this problem we tried to fix pulled us in an
388.
by ahaucnx 4y ago
Fun fact. We at AirGradient never had to find PMF. Why was that? Because the first 9 months it was a volunteer project fixing the air quality problem of the school our kids go to. During the so called "burning season" the school d
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by ahaucnx 4y ago
Thanks! Corrected.
390.
by ahaucnx 4y ago
Our old basic kit that you link above has also temperature inaccuracies due to its small footprint but we have a new kit that addresses these issues and is also available as a pre-soldered version for easy assembly: https://www.a

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