“A Breath of Fresh Air?”
by Rick Saylor

Take a deep breath. Go on, a really deep breath. Feels good, doesn’t it? Breathing is something you usually don’t take much notice of, yet is vital for your continuing survival. We can’t last more than a few minutes without breathing, taking in oxygen that is needed to fuel each of our body’s cells and flushing out unneeded waste materials, primarily carbon dioxide. Each breath you take while at rest is about 500 milliliters (roughly one-half of a quart) in volume. But did you know that with each breath, you also inhale a variety of other substances besides oxygen?

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“Underestimating Ammonia”
by LaToya Myles

A 2009 Nature Geoscience described how satellite data may be used to identify global ammonia hotspots. Ammonia emissions are difficult to measure and model, leading to large uncertainties in global and regional inventories. ARL scientist LaToya Myles penned a News & Views article in the same issue explaining the contributions that satellite measurements of ammonia can make to air quality research and international policy development.

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