jeffalk 0 research notes and 0 wiki edits | Joined over 3 years ago

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" Hi @samr. All the comments above are good and hopefully helpful and your questions are astute. I'm curious as to what led you to "air quality" a..." | Read more » about 2 months ago
" @Tomp, I'm not sure I understand your question but "particle counters" are basically counting particles and converting the counts to densities. T..." | Read more » about 2 months ago
" Thanks @cfastie for your comment. Some of it however is not clear to me so I'd appreciate some clarification. You write: "To be reminded that the..." | Read more » about 2 months ago
" Hi @OrionAllgaier, It's great to be curious and I'm sorry I can't answer your questions. But I am also curious. To my mind if one is trying to pr..." | Read more » 2 months ago
" Hi @kahlilkochiyama and @shannonkmcalpine, I just searched for air quality in Gardena, Ca, and found an article in the Daily Breeze, https://www.d..." | Read more » 3 months ago
" @warren, what is "helpful", as you know, depends on the intended use. Data from unknown and unsubstantiated sources can be unreliable depending ..." | Read more » 3 months ago
"Hi @kahlilkochiyama and @shannonkmcalpine Some suggestions for beginning questions for air monitoring in the Los Angeles area: There are many go..." | Read more » 4 months ago
"@cfastie is certainly correct in his comments that each of the purple air devices reads, in general, higher than the Grimm. (Almost all slopes (coe..." | Read more » 6 months ago
"I just reviewed this conversation and would like to add to it and would like comments from @sagarpreet and @guolivar if possible. About the USEPA ..." | Read more » 6 months ago
"I'd appreciate learning what in the document you referenced indicates to you that the PM10 is "biased rather high". Thanks " | Read more » 6 months ago
"Hi. Given that you mention "silica" and you are at UW Eau Claire ( western wisconsin sand mining...) I take your question to really ask whether on..." | Read more » 6 months ago
"I could be wrong but I do not believe optical particle counters use spectroscopy as the method is usually described. At any rate a number of years..." | Read more » 6 months ago
"I will most likely not be able to participate. I have been concerned and involved with frac sand air quality issues for years. Regarding the topic ..." | Read more » 9 months ago
"I'll try placing the graph again. I'm sometimes clutzy at this stuff! I'm trying to use jpg format. " | Read more » 9 months ago
"I tried to drag an image, tried copying and pasting, tried putting the image into a WORD document and dragging or pasting, you see the results above. " | Read more » 9 months ago
"Nice "sanity check" for pm "real time" monitors. I'd suggest it is always good practice when testing to make use of original data, in the case of..." | Read more » 9 months ago
"jiteovien: I realize you have put a considerable amount of effort into your project and are trying to do an excellent job. I believe you are exhib..." | Read more » 9 months ago
"I believe you are not quite correct in the determination of the AQI. First, the downloaded data from purple air gives concentrations, for pm2.5 th..." | Read more » 9 months ago
"If no one has volunteered to help them out, I'd be glad to try. Send me an email for a contact person. Or send them my email: joanjeff@centurylin..." | Read more » 9 months ago
"HI, Thanks for the update. I have a few questions though. You are apparently enthralled by the EPA Air Quality Index. Why?? My understanding, at ..." | Read more » 10 months ago
"Some hopefully helpful comments: particulate matter in air is very different than lead concentration in soil. PM2.5 has a regional aspect. To see t..." | Read more » 10 months ago
" My quick perusal of the attached pdf didn't find anything about effects of humidity. What you say about humidity effecting size makes sense but ..." | Read more » almost 2 years ago
" Yes is the simple answer: high humidity and/or moisture can effect particulate counts by raising them. Once you accept this the next step is how..." | Read more » almost 2 years ago
"Nicely done @matthew. I'm sure you all had a lot of fun. A few comments: Sometimes the text says the monitoring is for pm10 whereas the notes say ..." | Read more » about 2 years ago


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