The picturesque hazes of Tennessee's Smoky Mountains appear when volatile organic chemicals released by trees react with other gases in the atmosphere. And every time a raindrop falls into the ocean, microscopic droplets of salt water splatter upward into the atmosphere. Both mountain haze and fine ocean spray are nature's aerosols. People's penchant for burning fossil fuels is now creating a rival source of aerosol formation.
Note: To comment, Science News subscribing members must now establish a separate login relationship with Disqus. Click the Disqus icon below, enter your e-mail and click “forgot password” to reset your password. You may also log into Disqus using Facebook, Twitter or Google.