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Pandemic Has Kick-started an Urban Motorcycle Boom. Are Cities Rready?

Seems clear to me: In the (near) future we who are still riding will likely be on electric 2-wheelers.
 
Particulate Matter (PM) 2.5

I think they were referring to PM 2.5 in the article, long a problem air pollutant of heightened concern due to its small size:
1. Particle Pollution
2. Health Effects of Pariculate Matter

A brief search yielded a couple of peer-reviewed research articles:
1. Human health risk assessment of Tire and Road Wear Particles (TRWP) in air
2. Evaluation of Tire Wear Contribution to PM2.5 in Urban Environments

IMO, the interesting part of our understanding of particulate matter effects is the impact of microplastics to low-income, urban, and ethnic minority populations in and near high traffic areas. In Houston, there is increasing awareness of the correlation between increased health risk and exposure to PM 2.5 associated with major roadways, but it wouldn't be surprising to see similar correlations between chronic microplastic exposure from vehicle-related PM 2.5 in the ambient air in these areas to other end points like cancers and developmental disorders.
 
jad01 said:
I think they were referring to PM 2.5 in the article, long a problem air pollutant of heightened concern due to its small size:
1. Particle Pollution
2. Health Effects of Pariculate Matter

A brief search yielded a couple of peer-reviewed research articles:
1. Human health risk assessment of Tire and Road Wear Particles (TRWP) in air
2. Evaluation of Tire Wear Contribution to PM2.5 in Urban Environments

IMO, the interesting part of our understanding of particulate matter effects is the impact of microplastics to low-income, urban, and ethnic minority populations in and near high traffic areas. In Houston, there is increasing awareness of the correlation between increased health risk and exposure to PM 2.5 associated with major roadways, but it wouldn't be surprising to see similar correlations between chronic microplastic exposure from vehicle-related PM 2.5 in the ambient air in these areas to other end points like cancers and developmental disorders.
Click to expand...

Mechanics have been warned for many decades on the dangers of brake dust. Just consider to amount of brake dust generated on a busy urban boulevard with stop lights at every block. Rapid accel, followed by decel. Continuously during day.

Sprawl, without plannning, can easily create these situations.
 
jad01 said:
I think they were referring to PM 2.5 in the article, long a problem air pollutant of heightened concern due to its small size:
1. Particle Pollution
2. Health Effects of Pariculate Matter

A brief search yielded a couple of peer-reviewed research articles:
1. Human health risk assessment of Tire and Road Wear Particles (TRWP) in air
2. Evaluation of Tire Wear Contribution to PM2.5 in Urban Environments

IMO, the interesting part of our understanding of particulate matter effects is the impact of microplastics to low-income, urban, and ethnic minority populations in and near high traffic areas. In Houston, there is increasing awareness of the correlation between increased health risk and exposure to PM 2.5 associated with major roadways, but it wouldn't be surprising to see similar correlations between chronic microplastic exposure from vehicle-related PM 2.5 in the ambient air in these areas to other end points like cancers and developmental disorders.
Click to expand...

Yes, brake dust and micro bits of rubber [ tire wear] left on roadways is what PM 25 is talking about.
 
36654 said:
Mechanics have been warned for many decades on the dangers of brake dust. Just consider to amount of brake dust generated on a busy urban boulevard with stop lights at every block. Rapid accel, followed by decel. Continuously during day.

Sprawl, without plannning, can easily create these situations.
Click to expand...

Absolutely. By coincidence, I am sitting in on a microplastics workshop today and tire wear and microplastics came up as an area of needed research, so no doubt, more data on exposure risk to come.
 
EUGENE said:
Yes, brake dust and micro bits of rubber [ tire wear] left on roadways is what PM 25 is talking about.
Click to expand...

Yes, you are correct, but I think the article meant to refer to PM 2 point 5, as in 2.5 micrometers or less (not PM 25)- I think that was a misprint on behalf of the article. PM 25 (25 microns) fall in a much larger range of particles that, when inhaled, are filtered out of your sytem before reaching your lungs (and thus your bloodstream) and present far less risk of health affects.
 
jad01 said:
Yes, you are correct, but I think the article meant to refer to PM 2 point 5, as in 2.5 micrometers or less (not PM 25)- I think that was a misprint on behalf of the article. PM 25 (25 microns) fall in a much larger range of particles that, when inhaled, are filtered out of your sytem before reaching your lungs (and thus your bloodstream) and present far less risk of health affects.
Click to expand...

Not the first time a journalist blew it by a decimal point.
 
jad01 said:
Absolutely. By coincidence, I am sitting in on a microplastics workshop today and tire wear and microplastics came up as an area of needed research, so no doubt, more data on exposure risk to come.
Click to expand...

Perhaps, there's a reason why so many low income children suffer from asthma.....
 
EUGENE said:
Yes, brake dust and micro bits of rubber [ tire wear] left on roadways is what PM 25 is talking about.
Click to expand...

And remember that brake pads used to contain asbestos. https://asbestosvictimadvice.com/2017/04/garage-mechanics-1970s-brake-pad-asbestos-risk/

I am reminded of "death hill" in northern Kentucky where I-75NB dives down steeply to cross over the Ohio River. Must have been tons of asbestos in that area back in the day.

And the above article points out that some brake pads from China still contain asbestos.

Harry
 
EUGENE said:
Read what PM 25 is.
Brake and tire wear left on roadways!
I can't believe this!
Click to expand...

To me this kind of measurement is consistent with the measurements done of highway and roadside lead levels which helped make the case for unleaded fuel. All that rubber wearing off of tires doesn't evaporate. :)
 
GREGFEELER said:
To me this kind of measurement is consistent with the measurements done of highway and roadside lead levels which helped make the case for unleaded fuel. All that rubber wearing off of tires doesn't evaporate. :)
Click to expand...

No, it doesn't evaporate. But it does become airborne. It also washes off the roadways (and surrounding areas) and into the watershed, where the contaminates dissolve into the water. The particulates that remain continue to get washed downstream and become part of the sediment.

In dryer climates, the particulates spend much more time airborne, until it either settles in various corners or is lifted on the wind to be deposited with rain somewhere else.
 
r0ckrat said:
No, it doesn't evaporate. But it does become airborne. It also washes off the roadways (and surrounding areas) and into the watershed, where the contaminates dissolve into the water. The particulates that remain continue to get washed downstream and become part of the sediment.

In dryer climates, the particulates spend much more time airborne, until it either settles in various corners or is lifted on the wind to be deposited with rain somewhere else.
Click to expand...

Yes, exactly, which is where some of the pollution mentioned the the linked article comes from. Everything has an impact.
 
Last edited:
PGlaves said:
And if they didn't? Could you drive on it? Could you ride on it? In Arizona? In Minnesnowta?
Click to expand...

I’m pretty sure John was referring to the same thing I was. All those chemicals get into the public water supply real quick and are very difficult to remove. The salinity of water once salting starts is amazing.
OM
 
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