Is there anywhere where you can just buy one?

That's.... a long list. And no prices listed.

$100ish just for the enclosure and unknown for the electronics.

This seems more costly than several closed source solutions.

See above in the thread.

The electronics are complicated—at least to someone somewhat inept with such things.

https://www2.purpleair.com/ is big in US already

Oooh, that looks awesome. Thanks!

Yeah I edited a comment above with that finding. I was on mobile and didn’t see the tab

In the paper it defines "low cost" as less than $2500 - so I'm curious what the actual part cost is...

2nd spreadsheet tab on your link shows a sensor

Here is a popular design for an indoor sensor

https://www.airgradient.com/open-airgradient/instructions/diy-v3/

Burning any chemical with chlorine would be an incredibly ineffective way to produce phosgene gas. Past 200C it’s just going to form chlorine and carbon monoxide, which elemental chlorine in the air is probably going to find some nitrogen to team up with, hence the widely reported pool smell.

Just leaving any chemical with chlorine on the ground is likely to just deep through the ground until it finds a source of sodium and the sodium and chlorine do what they do best.

Between the pool smell, rashes and burns, and dead things in ditch water, and ignoring god know what other chemicals are just in ditch water from field run off, most likely explanation is that some people, and animals, were just exposed to elemental chlorine dissolved in water.

Did you not read what he said? You are just looking at whether it goes up or down. Being perfectly accurate is not necessary.

Its like if you had a weight scale. If it told you, tomorrow that you gained 15.3 lbs, and you repeated... and it said 13.9 lbs... 17.6 lbs, so on. It doesnt matter the exactness. The point is, your weight went up a lot in one day. That is good enough to make decisions on. Not for scientific studies.

Are the compounds going to stay around a long time?

Found the problem

Mobile Safari… 🤷

If you put a sensor in your own home, yes.

Or stay indoors where you can filter the air... Do you not know about air pollution and how much of a problem it is for folks with asthma or other breathing issues or just in general?

Air quality in polluted cities varies greatly day by day depending on wind. Wind blows away the bad stuff.

I live in a stretch of land called Cancer Alley, tons of industry right next door to the state Capitol.

For me it would be a fun project, second I don't trust the industry to self report, third I don't always trust state agencies due to how governance and the petrochemical industry fuck in the same bed.

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> scientific accuracy

But that's, like, the only real way to know for sure. Otherwise - it's either speculation or generalization?

Accuracy, repeatability, and defensibility.

I made & coded my own array of various sensors and have a blower/laser pm2.5 sensor, and I care not about its scientific accuracy, but I care about its ability to be able to tell me when air quality on my deck gets worse. It does that immediately with an LED that shines into my window with various colors depending on EPA air quality math. It could be huge percentages off scientifically accurate, but its going to tell me that the air quality got much worse. Its pm2.5 numbers are close to other stations around me regardless, but it definitely isn't a scientific instrument.

I'm not sure if most people buying these things care about its scientific accuracy, mainly just if things are getting worse outside.

> Would've been much easier with an ESP32 or Arduino board...

That's what I came here looking for. I made an ESP32/BME680 climate sensor a few months ago and haven't gotten around to calibrating/deploying it, was hoping I could pivot and turn it into an outdoor citizen science project

Open-source means open for the NSA to covertly install backdoors.

there is a pizzaria chimney right next to my room's window, i wonder if this can help me

lol