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Watch the following video and answer the questions:

http://www.youtube.com/watch?v=4oKL33ZAs9Q (Links to an external site.)
1) What is smog?
2) What is PM 2.5? Please specify its size in micron. If the diameter of a human hair is about 75 microns, compare the size of the human hair to PM 2.5. Why is it particularly harmful?
3) What are the three groups of people most vulnerable to smog effects?
4) Other than the recommendations in the video (i.e. carpool, ride a bus or light rail, walk or bike to work), can you think of something that you can do to contribute to cleaner air?

SAMPLE ASSIGNMENT

Sample-2

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