The Air We Breathe
NASA
Our atmosphere is vital to all living things on our planet. How much do you know about the air we breathe?
Answer questions like ...
- In the 10,000 years before the Industrial Revolution in 1751, carbon dioxide levels in the air rose by less than 10 percent. Since then they’ve risen by:
- Is air quality in the U.S. better or worse on average than it was 20 years ago?
- For how long do dust and soot generally remain in the air?
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