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1. At ground levels, smog is harmful to breathe and can negatively affect your health
2. Smog can travel great distances carried by the wind
3. In winter months, high smog concentrations have been measured in parts of Wyoming and Colorado
4. Children and the elderly are the most at risk from this type of pollution
5. Smog has been linked to a host of maladies, including premature mortality and heart failure
6. Smog is a strong respiratory irritant
7. Smog levels in the air typically climb during hot, sunny days
8. Studies have shown children with asthma are especially vulnerable to smog
9. More than 4 in 10 people in the United States live in areas with unhealthy levels of smog
10. Major sources of smog precursors include emissions from cars, trucks, and natural gas operations
For more clean air tweets follow Moms Clean Air Force on Twitter.