David Elfstrom 🍁's Avatar

David Elfstrom 🍁

@davidelfstrom.bsky.social

P.Eng, Energy management, measurement & verification. Toronto, Canada. Born 327ppm CO2. Climate Action & electrification; Safer infrastructure; cycling; air filtration & ventilation

11,029 Followers  |  1,386 Following  |  3,237 Posts  |  Joined: 18.05.2023
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Posts by David Elfstrom 🍁 (@davidelfstrom.bsky.social)

Neighbor told me that seeing me bike to work last week inspired her to start riding again!
🚲 It's like the opposite of the broken window theory. Ride, and others will join! #BikeTO

10.03.2026 01:09 β€” πŸ‘ 25    πŸ” 3    πŸ’¬ 0    πŸ“Œ 0
This Simple Change to The Law Makes Roads Safer for Everyone.
YouTube video by AverageManOnaBike This Simple Change to The Law Makes Roads Safer for Everyone.

Presumed liability would be a welcome change to reflect the inherent responsibility of those with the upper hand in physics

07.03.2026 16:18 β€” πŸ‘ 6    πŸ” 0    πŸ’¬ 1    πŸ“Œ 1
Wastewater virus signals for Toronto, for the 52 week period ending Friday March 6 2026 showing a drastic spike in COVID-19. RSV, Flu A and Flu B are also shown. The second highest spike was Flu A which peaked mid-December and was present for about 8 weeks, while COVID-19 has been at elevated and mostly growing levels since last spring.

Wastewater virus signals for Toronto, for the 52 week period ending Friday March 6 2026 showing a drastic spike in COVID-19. RSV, Flu A and Flu B are also shown. The second highest spike was Flu A which peaked mid-December and was present for about 8 weeks, while COVID-19 has been at elevated and mostly growing levels since last spring.

"There's something going around"
Yeah. It's COVID.
wwater.ca/Ontario/Toro...

07.03.2026 01:06 β€” πŸ‘ 88    πŸ” 37    πŸ’¬ 1    πŸ“Œ 0
Adopting permanent daylight saving time β€˜Spring forward’ on March 8 will be the last time change, ending twice-yearly clock changes

In the news release BC Gov put out announcing the switch to permanent daylight savings time, they cite a Stanford Medicine report to back up their decision, but the report actually says the opposite, that permanent standard time is better

news.gov.bc.ca/releases/202...

05.03.2026 01:14 β€” πŸ‘ 51    πŸ” 21    πŸ’¬ 2    πŸ“Œ 2

...which is bananas when you think of it

02.03.2026 13:07 β€” πŸ‘ 1    πŸ” 0    πŸ’¬ 1    πŸ“Œ 0

Bus service is far less comfortable but more reliable for Toronto-Ottawa

02.03.2026 13:02 β€” πŸ‘ 2    πŸ” 0    πŸ’¬ 1    πŸ“Œ 0

Universal Basic Income would result in an explosion of creative works and enhance culture

02.03.2026 12:59 β€” πŸ‘ 51    πŸ” 21    πŸ’¬ 2    πŸ“Œ 2
T. Ryan Gregory @tryangregory.bsky.social‬:

Carney: "Canada supports the United States acting to prevent Iran from obtaining a nuclear weapon and to prevent its regime from further threatening international peace and security."

Canadians: "No we f*cking do not!"

The polling after this will be interesting for sure.

β€ͺKamala Harris‬ @kamalaharris.com‬ :
Donald Trump is dragging the United States into a war the American people do not want. Let me be clear: I am opposed to a regime-change war in Iran, and our troops are being put in harm’s way for the sake of Trump’s war of choice.

T. Ryan Gregory @tryangregory.bsky.social‬: Carney: "Canada supports the United States acting to prevent Iran from obtaining a nuclear weapon and to prevent its regime from further threatening international peace and security." Canadians: "No we f*cking do not!" The polling after this will be interesting for sure. β€ͺKamala Harris‬ @kamalaharris.com‬ : Donald Trump is dragging the United States into a war the American people do not want. Let me be clear: I am opposed to a regime-change war in Iran, and our troops are being put in harm’s way for the sake of Trump’s war of choice.

Interesting timeline order here:

28.02.2026 22:59 β€” πŸ‘ 6    πŸ” 2    πŸ’¬ 0    πŸ“Œ 0

All over LinkedIn. Reasonable ideas fluffed up with that same cadence and lacking all personality, and when the poster replies to a comment without the LLM assistant using their own voice it's much better. People need to have confidence in their own capabilities.

28.02.2026 21:22 β€” πŸ‘ 3    πŸ” 0    πŸ’¬ 1    πŸ“Œ 0

One of the two has been part of a potato cartel charged with conspiring to raise frozen potato prices

28.02.2026 19:47 β€” πŸ‘ 0    πŸ” 0    πŸ’¬ 1    πŸ“Œ 0

I would formally like to apologize to the clown community for my emotional outburst that errantly equated the current administration as clowns.

Clowns are clearly superior, and the current administration is clearly deficient.

I will strive to do better.

28.02.2026 13:39 β€” πŸ‘ 96    πŸ” 2    πŸ’¬ 3    πŸ“Œ 0

Hard-hitting quote -- β€œI guess I just don’t have the right barometer to deal with this kind of capricious hate.”

28.02.2026 00:50 β€” πŸ‘ 8    πŸ” 3    πŸ’¬ 0    πŸ“Œ 0

I made it up, please use it!

28.02.2026 04:47 β€” πŸ‘ 1    πŸ” 0    πŸ’¬ 0    πŸ“Œ 0

Rather, they have invented a digital ouroborosloposaur

27.02.2026 21:11 β€” πŸ‘ 6    πŸ” 0    πŸ’¬ 1    πŸ“Œ 0

Except it's also up against the wall πŸ˜€

27.02.2026 14:48 β€” πŸ‘ 2    πŸ” 0    πŸ’¬ 0    πŸ“Œ 0

There's also the one that's like the first one with narrow spaces for a front wheel only, but horizontal on the ground with no frame locking ability. Basically a display rack for thieves.

27.02.2026 14:01 β€” πŸ‘ 8    πŸ” 0    πŸ’¬ 2    πŸ“Œ 0
Preview
Airborne Act Reintroduced Two House members, a Democrat and a Republican, revived a bill that was also considered in previous sessions.

US #IAQ advocates: bipartisan Airborne Act 2026 bill H.R. 7460 reintroduced. Endorsed by ASHRAE, provides tax credits for IAQ assessments and upgrades.

27.02.2026 02:43 β€” πŸ‘ 6    πŸ” 6    πŸ’¬ 0    πŸ“Œ 0

Smart!

19.02.2026 17:25 β€” πŸ‘ 3    πŸ” 0    πŸ’¬ 0    πŸ“Œ 0
Preview
Field Review: nanoDUST AirPN10 β€” The Next Generation of NanoparticleΒ Monitoring The landscape of air quality monitoring is shifting. For years, the focus remained on PM2.5 and PM10 (mass concentration), but we are increasingly realizing that the most dangerous threats are the ones we can’t weigh. Ultrafine particles (UFPs), or nanoparticles, are so small they penetrate deep into the bloodstream, yet they often escape traditional sensors and regulatory implementations. Enter the…

Field Review: nanoDUST AirPN10 β€” The Next Generation of NanoparticleΒ Monitoring

The landscape of air quality monitoring is shifting. For years, the focus remained on PM2.5 and PM10 (mass concentration), but we are increasingly realizing that the most dangerous threats are the ones we can’t weigh.…

19.02.2026 10:50 β€” πŸ‘ 3    πŸ” 2    πŸ’¬ 1    πŸ“Œ 0
Tabby cat with heart shape marking on his chest, wearing a burgundy bow tie. Image annotated with a red pen outline of the marking

Tabby cat with heart shape marking on his chest, wearing a burgundy bow tie. Image annotated with a red pen outline of the marking

Feb 14 #caturday from this gentlecat who wears his heart on his chest

15.02.2026 00:34 β€” πŸ‘ 162    πŸ” 10    πŸ’¬ 3    πŸ“Œ 2
Beastie Boys | So What’cha Want | Muppets Version
YouTube video by isthishowyougoviral Beastie Boys | So What’cha Want | Muppets Version

The YT algorithm brought me this delight from 11 years ago. Perfect editing

07.02.2026 22:16 β€” πŸ‘ 6    πŸ” 1    πŸ’¬ 0    πŸ“Œ 0

fraggle rock implies the existence of fraggle jazz and fraggle rap

03.02.2026 17:55 β€” πŸ‘ 1436    πŸ” 247    πŸ’¬ 140    πŸ“Œ 70
Preview
a cat with a serious look on its face and the words ooohhh written below it Alt: Cat from Puss and Boots animated movie that holds a paw up to its mouth and says "Ooohhh" for any dis.
03.02.2026 00:02 β€” πŸ‘ 1    πŸ” 0    πŸ’¬ 0    πŸ“Œ 0

Tricksy little earthpigs, my precious!

02.02.2026 18:03 β€” πŸ‘ 3    πŸ” 1    πŸ’¬ 0    πŸ“Œ 0

A decade ago there was a Shopify account selling great TTC merch, some celebratory and some satiric. It was quickly shut down. bsky.app/profile/davi...

02.02.2026 13:58 β€” πŸ‘ 2    πŸ” 0    πŸ’¬ 1    πŸ“Œ 0

Thank you, College St is my commute! I've been taking the subway instead of college streetcar because so many vehicles keep parking over the rails.

02.02.2026 00:05 β€” πŸ‘ 3    πŸ” 0    πŸ’¬ 0    πŸ“Œ 0

On-street parking on Bloor St. has been clear of snow for six days while snow makes the bike lane unusable. Excess snow should be dumped in the on-street parking spots. Prioritize movement of people, not storage of private property on a public road.

01.02.2026 22:41 β€” πŸ‘ 38    πŸ” 7    πŸ’¬ 2    πŸ“Œ 1

Spoiler-free summary:

01.02.2026 19:03 β€” πŸ‘ 2    πŸ” 1    πŸ’¬ 0    πŸ“Œ 0

No spoilers!

31.01.2026 21:00 β€” πŸ‘ 1    πŸ” 0    πŸ’¬ 1    πŸ“Œ 0

To continue with my longer Zone 2 ride, I added episode 7 of Star Wars: Andor season 1: "Announcement". It's right after the heist episode, and announces all of the ramifications of the heist, the retaliation of the Empire and the beginnings of the rebel uprising. Very fitting /3

31.01.2026 20:25 β€” πŸ‘ 2    πŸ” 0    πŸ’¬ 0    πŸ“Œ 0