| Author | Comment | Last activity | Moderation | ||
|---|---|---|---|---|---|
| guolivar | "The question if "which model is best" is not easy to answer as it is always dependent on what the results are used for. There have been a few studi..." | Read more » | about 8 years ago | |||
| mathew | "I know nothing about these models, but thought I'd add some links for reference AEROMOD: https://www3.epa.gov/scram001/dispersion_prefrec.htm#aerm..." | Read more » | about 8 years ago | |||
| kevinvivergy | "Thanks @drapoli! Yeah, when I built this thing I had not heard of Purple Air, I am really interested to learn more about it. The AQMD site has done..." | Read more » | over 8 years ago | |||
| drapoli | "Great discussion and a lot of good ideas. The AQ-SPEC group (www.aqmd.gov/aq-spec) has published results on several PM sensors other than the Dylos..." | Read more » | over 8 years ago | |||
| kevinvivergy | "Ahhh I see. And it looks like both ways showed that there is a big plume of particulates coming out of the rock quarry that dissipated over the rig..." | Read more » | over 8 years ago | |||
| mathew | "the authors did two levels of survey-- first the 6 minute 'snapshots' and then they used that to determine where to place passive monitors for long..." | Read more » | over 8 years ago | |||
| kevinvivergy | "Wow that is super interesting. That would definitely cover the variation over space... but what about if the levels vary over time in each particul..." | Read more » | over 8 years ago | |||
| mathew | "hah! school networks are always a problem. I posted a note recently on hotspot identification, the first stage of which involved a systematic surv..." | Read more » | over 8 years ago | |||
| kevinvivergy | "Thanks @mathew! Has certainly been an adventure. Only consistent issue has been school internet security protocols- they treat the Raspberry Pi as ..." | Read more » | over 8 years ago | |||
| mathew | "I'm revisiting your note, just want to say again how cool this is! great to see you're still up and posting data. " | Read more » | over 8 years ago | |||
| kevinvivergy | "Yeah I was thinking the same with the paint, introduces another source for pollutants. When I called the Dylos folks, they said that the device wi..." | Read more » | almost 9 years ago | |||
| DavidMack | "I was thinking you could expose the intake to ambient temperature in winter and by heating the enclosure you'd be warming the instrument and air in..." | Read more » | almost 9 years ago | |||
| kevinvivergy | "@Davidmack all good thoughts, thanks for the detailed response. -The big challenge with intake thing is that, if I understand your approach correc..." | Read more » | almost 9 years ago | |||
| DavidMack | "@kevinvivergy great detailed post. I'm not that familiar with the Dylos--haven't handled one--but looking at some photos maybe just cut out holes ..." | Read more » | almost 9 years ago | |||
| kevinvivergy | "Thanks @mathew! Yeah @jeff showed those to me, the AQICN one was pretty straight up too and I just went with theirs because I read their tutorial f..." | Read more » | almost 9 years ago | |||
| mathew | "awesome resources and case! hadn't seen this summary of low cost PM sensors: http://www.aqmd.gov/aq-spec/evaluations#&MainContent_C001_Col00=2 " | Read more » | almost 9 years ago | |||
| mathew | "if you're interested, we made Dylos drivers for Open Pipe Kit for the Pi-- its a flexible platform for pushing data to Phant and any other database..." | Read more » | almost 9 years ago | |||
| liz | "hey @jeff Laut! great to hear from you :) what sensitivity do you need on your particular matter sensors? " | Read more » | about 9 years ago | |||
| warren | "Very cool! Say hi for me if Jen Osha or Rob Goodwin are still at CRMW! We did these maps way back in 2010: http://publiclab.org/map/black-mountain..." | Read more » | about 9 years ago | |||
| el_tonio | "Hi Mat, have you thought of using a microscope? you can get ones that connect to smartphones, which depending on your phone should give you good re..." | Read more » | about 10 years ago | |||
| amysoyka | "Hey Matt, We just had an asbestos scare in my neighbourhood - so I wanted to make some cheap and simple collectors that can be hung up by resident..." | Read more » | about 10 years ago | |||
| jefffalk | "Let's try again. Gravimetric monitors capture particles and allow a weight of those captured to be determined. The distribution of aerodynamic diam..." | Read more » | over 10 years ago | |||
| mathew | "I've been operating on the assumption that the EPA/ISO standard = PM2.5. I guess this is an etymology question. which came first: PM2.5 or the EP..." | Read more » | over 10 years ago | |||
| jefffalk | "As I understand it PM2.5 implies an aerodynamic diameter of 2.5 microns, straight forward with no "mean" involved. The "mean" enters with the epa ..." | Read more » | over 10 years ago |