Live data from Hacker News

Air pollution directly linked to increased dementia risk

nature.com

41–50 of 138 posts

Re: Air pollution directly linked to increased dementia risk

#41

Dementia rates in Miami Dade are among the highest in the country while Utah is on the low end. What is striking is that Utah has worse air quality, which is a known risk factor, yet still shows lower prevalence. Why is that?

Perhaps there are more elderly people in Miami-Dade. What we should be asking is why aren't countries like China, India, and a lot of others in Asia suffering catastrophic rates of Dementia?

Good point. If air quality is a risk factor then how much?

Re: Air pollution directly linked to increased dementia risk

#43
post #11

Earlier quoted context omitted.

Not sure - it may very well be a different kind of pollution, but the raw PM2.5 values definitely look scary fast with any kind of "dry" cooking where you're browning anything

The raw PM2.5 values also skyrocket with just boiling tap water, on my Ikea Vindstyrka. Which makes me question how useful it is, presumably even with "dry" cooking a lot of meats and vegetables have water in them? https://www.ikea.com/gb/en/p/vindstyrka-air-quality-sensor-s...

It's actually not been established (at least, to the best of my knowledge) that PM2.5 caused by water vapor is any less harmful than other types of PM2.5 particulates.

And sure, yes, it's just water and its entirely plausible that water based PM2.5 is completely harmless... but wouldn't it be good to know that for sure?

Re: Air pollution directly linked to increased dementia risk

#44

What level of PM2.5 are they considering? I cannot read the full study

It feels like manipulative lying to me when they show the distribution of PM2.5 in the USA through that heat map, where the scale of pollution only goes to 15 when the most non-European block countries are way higher than 15.

[1] https://elements.visualcapitalist.com/mapped-air-pollution-l... polluted place

Re: Air pollution directly linked to increased dementia risk

#45

Dementia rates in Miami Dade are among the highest in the country while Utah is on the low end. What is striking is that Utah has worse air quality, which is a known risk factor, yet still shows lower prevalence. Why is that?

Perhaps there are more elderly people in Miami-Dade. What we should be asking is why aren't countries like China, India, and a lot of others in Asia suffering catastrophic rates of Dementia?

China's population skew heavily to middle age, whereas the US population pyramid is more like a population rectangle. It's entirely possible that they have an epidemic of dementia, but for a combination of social and demographic reasons that doesn't show in the data. Getting honest health data out of China, for example, is going to be pretty difficult.

https://en.m.wikipedia.org/wiki/File:China_population_sex_by...

https://www.populationpyramid.net/united-states-of-america/2...

Re: Air pollution directly linked to increased dementia risk

#46
post #28

Earlier quoted context omitted.

I'm on that boat. Though no one denies that the climate changes (but rather argue the about degree of human contribution and climate warming), destroying the beauty of nature and polluting the environment should go against global human conscience.

“The climate is always changing” Yes, those people are mostly imbeciles. They argue that because Obama has a house near the ocean… and because people fly… You can have a discussion with them but be prepared to start over in the same place the next time the subject comes up.

I think it's imbecile for self-righteous people to not spare a few moments of patience to politely try to correct those who were exposed to wrong information that caters to their bias. It's almost guaranteed that you also believe some sort of ridiculous conspiracy or bias, just like everyone else.

Maybe try listening to them. After all, scientists did switch from "global warming" to an unspecific term like "climate change", which gives them a reason for distrust. Same for other aspects of scientific notion, like distrust against scientists when they and politicians tried to cover up information on COVID and COVID vaccines.

Re: Air pollution directly linked to increased dementia risk

#47
post #4

Only so much you can do about ambient pollution in your city. Looking carefully at your cooking situation is worthwhile though. Was horrified by the spike in readings from stuff like steak in a pan

An air purifier is pretty cheap and will cut down on indoor pollution from cooking a lot. Or at least that’s how it seemed from the somewhat unreliable sensor I was using. https://www.nytimes.com/wirecutter/reviews/best-air-purifier...

FWIW, I think the wirecutter's quality for air purifiers is pretty bad, and likely more influenced by affiliate payments than science: https://dynomight.net/ikea-purifier/

Re: Air pollution directly linked to increased dementia risk

#48
post #28

Earlier quoted context omitted.

“The climate is always changing” Yes, those people are mostly imbeciles. They argue that because Obama has a house near the ocean… and because people fly… You can have a discussion with them but be prepared to start over in the same place the next time the subject comes up.

I think it's imbecile for self-righteous people to not spare a few moments of patience to politely try to correct those who were exposed to wrong information that caters to their bias. It's almost guaranteed that you also believe some sort of ridiculous conspiracy or bias, just like everyone else. Maybe try listening to them. After all, scientists did switch from "global warming" to an unspecific term like "climate c…

I’ve spent decades.

They’re imbeciles!

By the way, it’s still global warming but that was causing some confusion to some people because the weather locally might be cooler, warmer, wetter, dryer, etc.

Hence, climate change seems to better convey what people actually see.

Should we review what climate scientists actually said in the 1970s next?

What’s your favorite anecdotal (ie non science) story you go to?

Re: Air pollution directly linked to increased dementia risk

#50
This article repeats the common mistake of conflating correlations and causality. The main results are (1) that PM2.5 exposure is correlated with dementia in humans, (2) some experimental results with mice. This does not establish causality in humans. The paper is careful to stay juuuust on the right side of the line by carefully using "associated" in the right places. But the press release discards that pretense at rigor and jumps straight to full-on claims of causality in people:

> Long-term exposure accelerates the development of Lewy body dementia and Parkinson’s disease with dementia in people who are predisposed to the conditions.

I think it's entirely possible (perhaps even likely) that this is true. But the paper does not show it.

Post reply on HN