Hacker News
new
|
past
|
comments
|
ask
|
show
|
jobs
|
submit
login
stetrain
6 hours ago
|
parent
|
context
|
favorite
| on:
Banning lead in gas worked. The proof is in our ha...
Right but specifically solid particles in the air, not just gasses (CO2, NOX, etc.).
For example smoke and soot from combustion or dust particles from tires and brakes.
Guidelines
|
FAQ
|
Lists
|
API
|
Security
|
Legal
|
Apply to YC
|
Contact
Search:
For example smoke and soot from combustion or dust particles from tires and brakes.