>
>
>Well, here in Phoenix it is not caused by emissions from cars. It is
>particulates that cause the smog caused by: dust on road/land, dust
>from diesel engines (semi's), lawnmowers, construction sites, etc
>etc... I modern car engine is very clean.
No dispute that modern engines are cleaner, but, the haze continues to
grow, yet there are far less "old" cars on the roads, far more "clean"
cars, etc. As for Phoenix, and Flagstaff and the rest, you also have
to acknowledge that the populations of such areas have greatly
increased. If cars burn cleaner by 25% for example, but the numbers of
cars have quadrupled, what is the end result? Surely, you don't think
it's going to be cleaner air.
The context of the discussion was my "selective memory" and forgetting
how dirty cities used to be long ago. My response was that while true
about the cities, one also has to take into account ALL the associated
factors, such as indicated in the preceding paragraph. The problems of
pollution are often over-simplified. For example, modern cars are
cleaner so it must be the trucks and lawnmowers, while neglecting to
take into account increased populations.
One cow may fart a cloud of methane with little impact upon the
environment. But one million cows farting methane will surely impact
the region in which they are concentrated, as well as drifting over
other regions.
When i moved to this rural area, smog was practically nil. The
population at the time was around 36,000. Most were ranchers and
farmers, and most were driving older vehicles. That was 1986, when the
sky was clear, stars were bright and you could see for miles. The
population is now in excess of 100,000. Most people drive pretty nice
modern cars. Yet, many days a year, we get smog alerts now, and there
is a perpetual haze. We have no factories, etc. I don't think we have
that many lawnmowers.
--
Spike
1965 Ford Mustang Fastback 2+2, Vintage Burgundy
w/Black Std Interior, A Code 289 C4 Trac-Lok;
Vintage 40 16" rims w/225/50ZR16 KDWS BF Goodrich
gForce Radial T/As, Cobra drop; surround sound
audio-video...
See my ride at....
Feb 2004-
http://207.36.208.198/albums/86810/003_May_21_3004.jpg
Feb 2004-
http://207.36.208.198/albums/86810/005_May_21_2004.jpg
Jul 2005-
http://207.36.208.198/albums/86810/davescar_7_11_05_002.jpg
Jul 2005-
http://207.36.208.198/albums/86810/Engine_rebuild_006.jpg