Natural News 
September 19, 2012
(NaturalNews) When the denial of chemtrails is resolved, concerns of their content and their effects are raised. Two metals are consistently discovered worldwide in chemtrail analyses: barium and aluminum. They’re formed as nanoparticles easily breathed in by mammals and absorbed by plant life.
“Nanoparticles must be prepared and stored in a liquid medium designed to facilitate sufficient inter-particle repulsion that prevents aggregation.” In other words, nanoparticles will clump together again quickly in a powdered or solid medium. (Source 1 below)
A common phrase used for chemtrailing is aerosol spraying. Some claim the aerosol spraying is apart from the engines, and others claim it’s part of jet fuel. It could be both, but however the chemtrail is administered, the liquid that could maintain particulates as nanoparticles is there.
When they’re released into the upper atmosphere, the particles could retain their nanoparticle size and be easily absorbed as they filter down into the lower atmosphere and into our lungs and vegetation.
Chemtrail aluminum nanoparticles concerns
Dr. Russell Blaylock, retired neurosurgeon, neurotoxin expert and author, recently challenged noted pediatricians to take the same vaccinations they promote for children (http://www.naturalnews.com/035335_vaccines_Dr_Blaylock_children.html ).
He admits that at first he was skeptical about chemtrail reports until he began noticing them himself. Many still deny their existence even when they see them. The deniers usually claim they are contrails, which are ice particles from jet vapors that evaporate quickly and disappear. Conversely, chemtrails  linger across the sky and fan out.
Blaylock has become aware of their aluminum content. He explains that aluminum nanoparticles can enter the brain and spinal cord quickly through the lungs and nostrils, adding that nanopartilces are much more inflammatory to tissue than other forms of environmental aluminum .
He sees a connection of chemtrails’ aluminum deposits to the rise of neurodegenerative diseases, especially among young people. He’s talking about Alzheimer’s, Parkinson’s and Lou Gehrig’s diseases, not autism spectrum disorders from vaccines, which Dr. Blaylock has covered extensively.
Dr. Blaylock also expressed concern over the saturation of plant, crop life, and water with aluminum nanoparticles . He thinks chemtrailing must be curbed before it’s too late to minimize the threat of constant aluminum toxicity surrounding us. (Source 2 below)
Many realize that aluminum causes neurological damage unless our immune systems can quickly react or if we are able to eliminate the aluminum toxins quickly. Here’s one way (http://www.naturalnews.com/034756_silica_anti-aging_heavy_metals.html ).
Barium’s function in chemtrails
But what if our immune systems are suppressed? That may be the barium salts’ purpose in chemtrails. Besides irritating lungs by breathing it and causing serious heart and digestive problems by drinking barium  contaminated water, barium can directly diminish the immune system.
Laboratory findings have concluded that barium interferes with our bodies’ activation of T-cells, which are the attack cells against pathogenic microbes. If not directly involved with destroying pathogens, T-cells support other immune functions, including the destruction of cancer cells. (Source 3 below)
Thus chemtrails provide a one-two punch of irritant and immune suppression. There have been occasional chemtrail residue captures from air filters, open water containers, and rain water that don’t have as much aluminum, but are heavy with barium.
This allows other chemtrail heavy metals and biological disease agents found in some chemtrail samples to have a field day unless we do everything possible to maintain a strong immune system. (Source 4 below)
Interestingly, the Carnicom Institute has found chemtrail samples of diseased dried blood cells along with the major heavy metal contaminants. But we’re supposed to believe the “official” limited hangout that chemtrailing is for preventing global warming.
Eliminating heavy metals should be researched. You can start here (http://www.naturalnews.com )
Sources for this article include:
(1) http://www.malvern.com 
(2) http://thebovine.wordpress.com 
Carnicom Institute http://www.carnicominstitute.org/