"It's like trying to breathe through a tiny, tiny straw," said Samantha Kamen. Not even a regular straw, but like one of those little red coffee stirrers.

This is how Kamen, marketing and communications manager for the Asthma and Allergy Foundation of America, describes an asthma attack. It's a condition she's had since she was young. "It's a really scary feeling."

One of the top causes of an asthma attack? Air pollution. And it doesn't just affect asthma sufferers. More than half of Americans live in areas with unhealthy levels of air pollution. And it's been associated with heart disease, lung cancer, and respiratory problems.

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