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Yeah, he mixes and correlates CO2 with PPM which is unrelated. > When Jose-Luis Jimenez, an atmospheric chemist at the University of Colorado at Boulder, first

by jve 4y ago

Yeah, he mixes and correlates CO2 with PPM which is unrelated. > When Jose-Luis Jimenez, an atmospheric chemist at the University of Colorado at Boulder, first picked one up three years ago, he was shocked that it could hold its own against the machines he used professionally. And in his personal life, “it allows you to find the terrible places and avoid them,” he told me, or to mask up when you can’t Let him stuck the aranet in his mask and see how the reading goes. I have a question - is CO2 filterable by active carbon filter?

baliex 4y ago
For the benefit of other readers, I think you mean “..correlates CO2 with PM2.5..” I’m basically a layman here and I agree that CO2 and PM2.5 particles are completely unrelated. PPM is Parts Per Million, i.e. a general measure of density of one substance in another. So, CO2 at 500 ppm makes sense.
luma 4y ago
> is CO2 filterable by active carbon filter Absolutely not. If you want to lower CO2, open a window.
def_true_false 4y ago
Maybe the author just mangled the quote? It sounds like the context was preventing COVID transmission, it even mentions masks. One can reasonably say that the CO2 sensor doesn't distinguish air breathed out by others (dirty) from air breathed out by others and then cleaned by an air purifier (clean, but higher in CO2 than the outdoor baseline). So, if you are in an urban setting where the expected particulate levels are non-zero, you can tell whether the air around you was cleaned by a purifier using a particulate sensor. If it shows zero, it was probably cleaned to some extent.
kolinko 4y ago
It's not. You'd need a dedicated co2 scrubber, and it would be a pain to operate - if you had it running at home, it would gain ~1kg in mass daily (or it would need a dedicated connection to outside to throw co2 out of). Particulate matter, VOC, and other kinds of substances are a breeze to filter out compared to co2.

by jve 4y ago

baliex 4y ago

For the benefit of other readers, I think you mean “..correlates CO2 with PM2.5..” I’m basically a layman here and I agree that CO2 and PM2.5 particles are completely unrelated. PPM is Parts Per Million, i.e. a general measure of density of one substance in another. So, CO2 at 500 ppm makes sense.

luma 4y ago

> is CO2 filterable by active carbon filter Absolutely not. If you want to lower CO2, open a window.

def_true_false 4y ago

Maybe the author just mangled the quote? It sounds like the context was preventing COVID transmission, it even mentions masks. One can reasonably say that the CO2 sensor doesn't distinguish air breathed out by others (dirty) from air breathed out by others and then cleaned by an air purifier (clean, but higher in CO2 than the outdoor baseline). So, if you are in an urban setting where the expected particulate levels are non-zero, you can tell whether the air around you was cleaned by a purifier using a particulate sensor. If it shows zero, it was probably cleaned to some extent.

kolinko 4y ago

It's not. You'd need a dedicated co2 scrubber, and it would be a pain to operate - if you had it running at home, it would gain ~1kg in mass daily (or it would need a dedicated connection to outside to throw co2 out of). Particulate matter, VOC, and other kinds of substances are a breeze to filter out compared to co2.