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[quote=Anonymous][quote=Anonymous][quote=Anonymous][quote=Anonymous]Ultrafine particles are less than 100 nanometers in diameter — one one-thousandth the width of a human hair — and their impact on health is only beginning to be studied. Ultrafines aren’t specifically regulated by any state or federal air quality standards.

A higher proportion of the ultrafine particles (UFPs) in jet emissions are so small they can penetrate the central nervous system when inhaled, the report said.

Communities under flight paths, like SeaTac, Des Moines, Highline, Angle Lake, Beacon Hill and Rainier Valley, are exposed to those “ultra-ultrafines” when planes take off and land, researchers found.

The UW study adds to a growing international body of research on the particles, including some preliminary reports showing correlations between exposure to ultrafines and higher incidences of some kinds of cancer, as well as lung diseases that cause trouble breathing and deep, throaty coughs.

“Strong and consistent evidence from animal studies indicates that long-term exposure to UFPs is related to negative effects on the brain, nervous and respiratory system,” the state Department of Health concluded in a separate review of research on ultrafine particles released this month, funded by the Port of Seattle.

Generally, Austin said, ultrafine particles tend to agglomerate as they travel through the air — they stick together and become larger particles, which aren’t able to pass from the airways into the bloodstream. That’s typically what happens near busy roads.

But the super-small particles emitted by airplanes are forced directly downward by air currents and wing vortexes so rapidly that they haven’t agglomerated by the time they reach the ground, her team found.

[/quote]

Worth noting that the UW study (a) looked primarily at communities directly under the Sea Tac flight path, (b) focused primarily on locations where airplanes were at 750m (~2,500 feet) or lower altitude, and (c) involved a far busier airport than DCA.

Palisades is not directly under the DCA flight path, as the path follows the river.  There is of course variance -- some flights go directly over Palisades, some go over McLean, some go straight over the river.  The Sea Tac flight path has less variance as the flights are generally on a straight path to/from the runway (unlike the weaving path along the Potomac on the river approach/departure from DCA).  If you've ever lived in Seattle, this is easy to observe.

Flights taking off from DCA are typically at a higher elevation when they pass Palisades.  From Flightradar24, the typical elevation seems to be 3,000-3,500 feet.  The extra altitude presumably makes a difference.

Sea Tac has ~50% more flights per day than DCA (and with bigger aircraft, which presumably pollute more).

Be careful in extrapolating.[/quote]

Thanking you for looking up this info. I was pretty certain this was the case, and I was trying to decide if I cared enough to go find it.

And for the “jet vortices pushing particulates into your organs” poster — I’ve decided I’m going to try to be less snarky here, so I’ll just say: No. That’s not happening. [/quote]

Of course it’s happening [/quote]

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