If you felt like going for a walk in Los Angeles last Saturday
afternoon you would have been well advised not to. The air quality was (as we say) “unacceptable.” There are so many things about
life that are unacceptable but air quality is one of the few that gets an official designation. Above is how it
looked from where I was. It looked way
more dramatic elsewhere.
The sky was that color because of the “Sand Fire” which sounds a little
more “end of the world” than it actually was.
It was plenty serious enough – 37,000 acres of forest fire in the Sand
Valley, about 30 miles north of the city, up near Santa Clarita, 10,000 people evacuated, 18 homes destroyed
(all these figures provisional, of course), but the name invokes something even
more extreme: dunes bursting into flame, sand particles turning into molten glass, something
like Herzog’s Lessons of Darkness.
The LA Times helpfully ran an article under the
headline “Air quality around Sand fire is 'like being around second-hand
smoke,' expert says.” Some might have thought it was rather like being around
first-hand smoke, but then we’re not all experts.
The man they’d got to pontificate was Mark
Morocco, a clinical professor of emergency medicine at UCLA. “The danger posed
by the Sand fire depends on how close people are to the flames,” he said.
And did he have advice for walkers? Well
not specifically. “For everyone, it is
best to ‘throttle down on your exercise’ and get to places with better air
quality, Morocco said.”
There was a psychological
element too. “'People feel anxious about it when the sky looks like a zombie
apocalypse, when the sky is red and these smoke plumes are on the
horizon,' Morocco said. ‘If you have anxiety, you’re going to feel worse,
or if you have depression, you could actually get depressed.’" You don’t
say, Mr. Morocco.
Fact is, I’ve been watching
the skies more closely than usual as I continue to read Gavin Pretor-Pinney’s The Cloudspotters Guide. Of course those weekend air conditions above
LA weren’t clouds, which I suppose meant they couldn’t be spotted and named and
classified. But the most interesting section
I came across in Pretor-Pinney’s book was about cloud seeding by the Americans during the
Vietnam War, “Project Popeye” as it was known, designed specifically to mess up the Ho Chi
Minh Trail. This came as news to me
though I’m sure not to many.
As I understand it, the
Ho Chi Minh Trail was the supply route for men
and equipment that ran from North to South Vietnam via Laos and Cambodia. This was a monsoon region, and when the rains came down. the trail became impassable. The American military boffins reasoned that
the longer the rains went on, the more disruption there’d be. This was revealed to the American public in
an article by Seymour Hersh in the New York Times, July 3, 1973. For years apparently the American military had
been spraying chemicals (silver iodine
seems to have been the active ingredient) into the clouds above Laos, Vietnam
and Cambodia in order to make rain.
Frankly, the Ho Chi Minh trail
doesn’t look like it was a walk in the park even at the best of times, although
you could evidently get an elephant or two along at least part of it on a good day.
Project Popeye seems to
have worked pretty well in itself, not that the US won the war or anything. And then there was also "Project Commando Lava," created by some guys
at Dow Chemical. Aircraft dropped paper sacks filled with a mixture of Trisodium
Nitrilo-triacedic acid and Sodium Tripolyphosphate. When mixed with rainwater
this substance destabilized the soil and created “artificial” mud. In some quarters It gave rise to the slogan
"make mud, not war.”
And that is something
that the folks around Sand Valley (and elsewhere) will in due course have to
worry about. It’s much the same every
year around these parts. There’s a fire, scorched earth, destabilized
soil, then the rain comes and creates mud slides (real, not artificial) even
without chemicals. Anybody might think California was a war
zone.
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