The American Lung Association warns that a growing number of US residents are living in areas with unhealthy air pollution. More than 46.2 million people live in an area with unhealthful year-round levels of particle pollution.
http://www.stateoftheair.org/2014/key-findings/year-round-particle-poll…
More than 13 percent of people in the United States live in an area with too many days with unhealthful levels of particle pollution.
http://www.stateoftheair.org/2015/key-findings/short-term-particle-poll…
Over half of the population lives in 418 counties where they’re exposed to unhealthful levels, ones that could shorten life or cause lung cancer of either ozone pollution, or short-term, or year-round particle pollution.
Breathing fresh air and its quality is not a luxury, but a right. https://youtu.be/B1M894GH4q4
National Geographic: State of the Earth Air https://youtu.be/rIt-JNZ8-mI