Air pollution is a fact of life, but it can have serious effects on human health.

Air pollution, made up of things like noxious gases and fine particles produced by the burning of fossil fuels, can cause respiratory diseases, cardiovascular diseases, pregnancy complications, and even death, according to the National Institute of Environmental Health Sciences.

Exposure to air pollution exists in both urban and rural communities. Children, the elderly, and those suffering from respiratory disease, such as asthma, are the most vulnerable to air pollution.

To find some of the places in the U.S. with the cleanest air, we consulted Nomad List, a crowdsourced database that dynamically analyzes hundreds of thousands of data points in cities all over the world for things like cost of living, current weather, traffic, and air quality for people who work on the go.

Nomad List uses an Air Quality Index in which 0-25 is great air quality, 25-50 is good, above 50 becomes bad, and above 100 is very unhealthy.

All of the places on this list fall in the 'great' category, based on the annual average air quality provided by Nomad List.

This article was written by a staff member of TheStreet.