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The system is called Soluble Acidic Gases and Aerosols.

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We have two parts to it.

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One is a filter that's a bulk filter.

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It collects aerosols from very tiny sizes

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up to about 5 microns.

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So we measure 8 or 9 ions,

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tracers of pollution,

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sea salt, biomass burning, and dust.

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So the combinations or the ratios

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tells us something about the source of the air.

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Then we run the mist chamber IC sampler,

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which collects soluble gases

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and fine, submicron aerosols into a liquid.

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And we make injections

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right onto the IC on the airplane

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so we get data about 3 or 4 minutes

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after we collect the sample.

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And there the focus is

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primarily on nitrate and sulfate.

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Well the filter sampling,

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it's a manual system.

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So you got to put the filters in there

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and open the valves.

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So every few minutes I gotta get up

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and put in another filter,

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and take the ones out

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and put them back here in the cooler

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so they don't degrade.

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I think that we're going to see

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really clean air,

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but we're also going to see

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pockets of pollution from various sources. 

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A long time ago

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we came down to the Southern Ocean

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on a NASA mission called ChemTropics,

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and the same idea

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we're trying to get into the tropics

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and find this really clean air.

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But we were seeing biomass burning plumes

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from Africa and South America

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in the middle of the Pacific Ocean.

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So I think we will see stuff like that.

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It's just not clear

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how much of an effect does that have.

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If you don't go after them

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and you just fly around,

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do you see them 10 percent of the time

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or 50, or...? We don't know.

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So that's why this mission is not targeting them.

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It's trying to sample them

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as they happen to be there.

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We're certainly going to hit them

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throughout the four seasons

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and in all different parts of the trip.