3 ms·

Interesting to note that unleaded gas also has lead about 0.05g per gallon which is a lot when you consider how much gas is burned in a typical big city everyda

by clukic 5y ago

Interesting to note that unleaded gas also has lead about 0.05g per gallon which is a lot when you consider how much gas is burned in a typical big city everyday. Aviation gas has 2 grams per gallon, so if you live near an airport you're probably getting a pretty steady diet of lead.

axiak 5y ago
The actual amount of gallons of gas burned in planes using AVGas is extremely small compared to the gallons of gas burned by cars or by planes using jet fuel. Unless you were on the tarmac with prop planes running, I doubt you'd smell the lead.
- Johnny555 5y ago
  What about the ground water near popular general aviation airports? Granted, there aren't nearly as many airplanes as cars, but over years, contamination can accumulate. I remember a small lake in San Francisco that had to be decontaminated due to lead pollution from cars: https://www.sfgate.com/bayarea/article/Workers-pour-poison-into-Mountain-Lake-begin-5888355.php https://www.sfgate.com/bayarea/article/Workers-pour-poison-i... "Lead from car emissions seeped into the water for decades until leaded gasoline was phased out beginning in the 1970s. The lead combined with pesticides flowing in from the golf course to form a toxic stew."
nate_meurer 5y ago
The EPA limits unleaded gasoline to 0.5 g/gal, but that doesn't mean your gasoline actually contains that much. The regs are meant to forgive some amount of cross-contamination from facilities that also handle avgas. I don't have any information on what values are typically encountered. You're right, 0.5 g/gal is a lot of lead.
lostlogin 5y ago
> 2 grams per gallon I’m from a fully metric land, is the above a common way to express a ratio? It certainly stuck out to me but it’s a pretty tidy measure.
- jjoonathan 5y ago
  Hey, it doesn't even have internal unit cancellation or convention ambiguity like "kilowatt hours per month". We can do worse!
- alethiophile 5y ago
  Gas in the US (aviation or automotive) is always sold in gallons, but quantity of chemicals (outside of cooking) usually done in grams/kilograms. Thus, grams per gallon is fairly intuitive in context.
maxcan 5y ago
AvGas is only used by small, piston powered aircraft. Jets fly on Jet-A which is basically high-grade kerosene and AFAIK, lead free. The only airports that could be giving off lead would be very busy, general aviation airports like Van Nuys, not commercial airports like LAX or JFK. Even then, the effect is barely detectable.
- GekkePrutser 5y ago
  And a lot of those are getting converted to turbodiesel now which means they can run on Jet-A1 too. Avgas is really expensive and hard to get these days.
  - maxcan 5y ago
    In Europe yes, less so in the US.

by clukic 5y ago

axiak 5y ago

The actual amount of gallons of gas burned in planes using AVGas is extremely small compared to the gallons of gas burned by cars or by planes using jet fuel. Unless you were on the tarmac with prop planes running, I doubt you'd smell the lead.

Johnny555 5y ago
What about the ground water near popular general aviation airports? Granted, there aren't nearly as many airplanes as cars, but over years, contamination can accumulate. I remember a small lake in San Francisco that had to be decontaminated due to lead pollution from cars: https://www.sfgate.com/bayarea/article/Workers-pour-poison-into-Mountain-Lake-begin-5888355.php https://www.sfgate.com/bayarea/article/Workers-pour-poison-i... "Lead from car emissions seeped into the water for decades until leaded gasoline was phased out beginning in the 1970s. The lead combined with pesticides flowing in from the golf course to form a toxic stew."

nate_meurer 5y ago

The EPA limits unleaded gasoline to 0.5 g/gal, but that doesn't mean your gasoline actually contains that much. The regs are meant to forgive some amount of cross-contamination from facilities that also handle avgas. I don't have any information on what values are typically encountered. You're right, 0.5 g/gal is a lot of lead.

lostlogin 5y ago

> 2 grams per gallon I’m from a fully metric land, is the above a common way to express a ratio? It certainly stuck out to me but it’s a pretty tidy measure.

jjoonathan 5y ago
Hey, it doesn't even have internal unit cancellation or convention ambiguity like "kilowatt hours per month". We can do worse!
alethiophile 5y ago
Gas in the US (aviation or automotive) is always sold in gallons, but quantity of chemicals (outside of cooking) usually done in grams/kilograms. Thus, grams per gallon is fairly intuitive in context.

maxcan 5y ago

AvGas is only used by small, piston powered aircraft. Jets fly on Jet-A which is basically high-grade kerosene and AFAIK, lead free. The only airports that could be giving off lead would be very busy, general aviation airports like Van Nuys, not commercial airports like LAX or JFK. Even then, the effect is barely detectable.

GekkePrutser 5y ago
And a lot of those are getting converted to turbodiesel now which means they can run on Jet-A1 too. Avgas is really expensive and hard to get these days.
- maxcan 5y ago
  In Europe yes, less so in the US.