I recently bought one of these air quality monitors and got to take it out for some measurements!

I'll share some findings in this thread.

CCing @CO2Guerrillas here, in case they would like to share.

A very quick intro:

This device measures:

-CO2 concentration
-relative humidity
-atmospheric pressure
-temperature

I spent ~$200 on Amazon. It pairs with your phone and you can watch data come in every minute or so.

https://t.co/aoXjyq8kdu
A lot of covid transmission is airborne. So, having clean air is a must for reducing transmission.

A great way to see how much clean air you are getting is to measure CO2 concentration.

Too high -> you could use more ventilation -> open some windows!
So, I walked around town and took some measurements.

Outdoor CO2 concentration should be about 400 ppm. I haven't calibrated my device yet, so I measured ~470. Close enough.

<800 is good for indoors. Something like 2000 is very bad.

https://t.co/oZAkVnr9ts
For a reference: inside my apartment I quickly get ~1000 ppm if I don't have windows open. Maybe ~1500 if things get bad.

If I crack some windows, even just barely, it gets down to ~600 ppm very quickly, and my heater can keep the apartment ~70 F no problem.
First stop: a small shop in Harvard Square. It is about 60 ft long, 20 ft wide, and usually has ~3 people in there.

CO2: 937 ppm.

Not great, not horrible. Surprisingly (to me), this place had the highest CO2 on my trip. It did have a purifier, which was nice.
Next stop: a very similar store, but it has less business and only ~1 person in there most of the time.

~700 ppm. Still good.
Plant shop around the corner, which was a bit larger in size, maybe 2-3x, but also maybe ~4 people in there on average.

650 ppm. Not bad!

Fun fact: this shop is 103 years old now.
Next stop was interesting: a paper store that was split into two completely separate rooms. Both the same size, and both had ~2 people in there. One had the AC blasting, the other had it off.

Basically the same results in both: 650-700 ppm
Next stop, a 2-floor CVS which is usually pretty busy. Picked a spot near the center of the store:

620 ppm. Still not bad!

The doors open often, and the AC was on.
Next stop was the Harvard bookstore.

560 ppm.

Very nice! Especially since my device reads ~470 outside.

Took this sample in the essential ideology section.
I was skeptical about the low values, so I went to another section (science books now).

520. Still good!

The whole store had their AC up very high. I could see many of the signs shaking due to airflow inside. I assume they were piping in outdoor air.
Overall, I was impressed with most places! I expected worse, but I also didn't go into any of the more dangerous areas, like restaurants (we still have indoor dining in Boston).
A side note: CO2 concentration is just a proxy for air quality. Not perfect, and many other things matter too.

Follow these people instead of me to get some real science:

@kprather88 @jljcolorado @ShellyMBoulder @CO2Guerrillas @jksmith34

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Rig Ved 1.36.7

To do a Namaskaar or bow before someone means that you are humble or without pride and ego. This means that we politely bow before you since you are better than me. Pranipaat(प्राणीपात) also means the same that we respect you without any vanity.

1/9


Surrendering False pride is Namaskaar. Even in devotion or bhakti we say the same thing. We want to convey to Ishwar that we have nothing to offer but we leave all our pride and offer you ourselves without any pride in our body. You destroy all our evil karma.

2/9

We bow before you so that you assimilate us and make us that capable. Destruction of our evils and surrender is Namaskaar. Therefore we pray same thing before and after any big rituals.

3/9

तं घे॑मि॒त्था न॑म॒स्विन॒ उप॑ स्व॒राज॑मासते ।
होत्रा॑भिर॒ग्निं मनु॑षः॒ समिं॑धते तिति॒र्वांसो॒ अति॒ स्रिधः॑॥

Translation :

नमस्विनः - To bow.

स्वराजम् - Self illuminating.

तम् - His.

घ ईम् - Yours.

इत्था - This way.

उप - Upaasana.

आसते - To do.

स्त्रिधः - For enemies.

4/9

अति तितिर्वांसः - To defeat fast.

मनुषः - Yajman.

होत्राभिः - In seven numbers.

अग्निम् - Agnidev.

समिन्धते - Illuminated on all sides.

Explanation : Yajmans bow(do Namaskaar) before self illuminating Agnidev by making the offerings of Havi.

5/9
"I really want to break into Product Management"

make products.

"If only someone would tell me how I can get a startup to notice me."

Make Products.

"I guess it's impossible and I'll never break into the industry."

MAKE PRODUCTS.

Courtesy of @edbrisson's wonderful thread on breaking into comics –
https://t.co/TgNblNSCBj – here is why the same applies to Product Management, too.


There is no better way of learning the craft of product, or proving your potential to employers, than just doing it.

You do not need anybody's permission. We don't have diplomas, nor doctorates. We can barely agree on a single standard of what a Product Manager is supposed to do.

But – there is at least one blindingly obvious industry consensus – a Product Manager makes Products.

And they don't need to be kept at the exact right temperature, given endless resource, or carefully protected in order to do this.

They find their own way.