Toots for kdnyhan@social.esmarconf.org account

Written by Kate Nyhan on 2025-01-23 at 01:07

Do I know anyone who has successfully taken a UK passport photo themselves (instead of going to a shop)?

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Written by Kate Nyhan on 2025-01-22 at 23:41

Does this puddle suggest that my wiper fluid reservoir broke? Or something worse?

[#]cars

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Written by Kate Nyhan on 2025-01-22 at 13:11

Just read two different manuscripts that are both VERY GOOD. Sometimes all the hassle seems worth it

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Shared by Kate Nyhan on 2025-01-21 at 20:53 (original by Jay Baker)

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Written by Kate Nyhan on 2025-01-20 at 02:17

1. Carefully divide the carrot slices between myself and the dog

2. Hold the dog up so she can see that there are no more carrot pieces on the counter

Is this normal? 😅

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Shared by Kate Nyhan on 2025-01-19 at 21:23 (original by Ben again!)

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Written by Kate Nyhan on 2025-01-19 at 20:47

Ok I find it odd that they decided to park the pickup trucks with the salt supply in the N and S lanes right opposite each other on the middle of the bridge, creating a bottleneck for the cars, whose drivers will surely blame "the bike lanes".... But they moved one of the trucks after a few minutes :)

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Written by Kate Nyhan on 2025-01-19 at 20:40

Ok technically Harvard Bridge

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Written by Kate Nyhan on 2025-01-19 at 20:40

A+ for... Not sure who is responsible for the safety of the bike lanes on the Mass Ave Bridge, but they have a contractor putting road salt in the bike lane and pedestrian walkway to prep for the storm coming tonight, so bravo! #Boston

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Shared by Kate Nyhan on 2025-01-19 at 20:36 (original by Kathryn Greenhill)

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Written by Kate Nyhan on 2025-01-19 at 20:30

When I went to Burdick's in Coolidge Corner. I was wearing a respirator, but my friend who was drinking hot chocolate and eating cake wanted to leave when they saw these numbers, so we went for a walk.

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Shared by Kate Nyhan on 2025-01-19 at 20:21 (original by aœ bärlin)

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Shared by Kate Nyhan on 2025-01-19 at 20:21 (original by ikuo)

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Written by Kate Nyhan on 2025-01-19 at 18:46

We can't smell or taste or hear high levels of CO in indoor air. But with these monitors from the library, we can find out -

Hey, if I have six people breathing in my living room, and I crack two windows, the CO2 numbers are as low as if I had one person breathing in the room with the windows closed

Or

Hey, this grocery store's ventilation system copes a lot better with the crowd at 8 pm than the crowd at 6 pm

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Written by Kate Nyhan on 2025-01-19 at 18:43

So why does CO2 ppm matter?

• too much CO2 makes you sleepy. Kids do better on standardized tests when they have fresher air!

• when there's a lot of CO2 in the air from people breathing, if any of those people currently have COVID or flu or RSV, those viruses are going to be in the air too, floating around in tiny aerosol particles, waiting for you to inhale them (unless they get captured by the filter media in air filters or masks)

• SARS-CoV-2 aerostability is higher in high CO2 environments

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Written by Kate Nyhan on 2025-01-19 at 18:38

Here's an interesting way to play with CO2 monitors in an interventional way, not just observational: go in your car, keep breathing, and play with environmental variables - windows open or closed, ventilation set to off/recirculate/outdoor air.

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Written by Kate Nyhan on 2025-01-19 at 18:28

For example, I took this pic right after leaving a grocery store. That high above the background level? When I was in the grocery store, about 2% of the air around me was recently exhaled by the other people in the store.

I like people but I don't like them that much! Especially right now, when we know from CDC data that New England is still at the "very high" level of SARS-CoV-2 in our region's wastewater.

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Written by Kate Nyhan on 2025-01-19 at 18:21

This restaurant isn't near that level right now, but a lot of grocery stores, bookstores, restaurants, and also cars and homes can get CO2 ppm concentrations that are way higher.

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Written by Kate Nyhan on 2025-01-19 at 18:19

The CDC has a webpage about using CO2 monitoring to track and improve ventilation; they said to consider supplemental air filters when the CO2 ppm is above 800.

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Written by Kate Nyhan on 2025-01-19 at 18:17

Then I went inside to pick up takeout. Now the CO2 ppm reading is 577. That increase from the background level? That extra CO2 in the air in the restaurant might have come from the customers and the workers breathing out, and from the gas burners in the kitchen.

577 is higher than the outdoor number, but it's also quite low indeed for an indoor space.

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