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Carnegie Mellon study shows skin-aging radicals age naturally formed particles in the air
Date:8/9/2012

entrations of aerosols, especially particles less than 2.5 micrometers in diameter.

"There's a very, very strong body of data that establishes that fine particles in the air we breathe have a significant bad effect on people. What is less well understood is how the size and chemical composition of those particles influences that effect," Donahue said.

What complicates matters is that the atmosphere is a highly oxidizing, highly reactive place, which means that aerosols are transformed very rapidly into particles that can have completely different chemical compositions. Donahue and colleagues in the Center for Atmospheric Particle Studies were the first to describe the chemical processes involving free radicals that transform aerosols emitted by man-made sources like diesel exhaust. But this mechanism didn't explain what happens to natural compounds when they enter the atmosphere.

"It was too aggressive and made too much stuff, so the modelers simply turned off biogenic aging entirely. This seemed a little extreme," Donahue said. He suspected that the biogenic particles would age too, but in a different way.

Donahue, together with colleagues in Germany, Sweden, Denmark and Switzerland, set out to test this hypothesis using fake atmospheres called smog chambers, which contain several cubic meters of air in an enclosed space in the laboratory. They fed alpha-pinene, an aerosol released by pine trees, and ozone into the smog chambers and then added hydroxyl (OH) radicals, which are naturally-occurring, highly-reactive molecules that drive reactions with other chemicals present in the air. The researchers gathered data from four different smog chambers and fed it into a computer model that they developed. They discovered that OH ages the particles, altering their properties and concentrations and producing three times more particulate matter than what was originally released into the atmosphere.

"The most intriguing part i
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Contact: Jocelyn Duffy
jhduffy@andrew.cmu.edu
412-268-9982
Carnegie Mellon University
Source:Eurekalert

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