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Go online to access additional resources, including labs, worksheets, multimedia, and resources in Spanish.

Online enVirOnmental ScienceHMDScience.com

Section 1What Causes Air Pollution?

Section 2Air, Noise, and Light Pollution

Section 3Acid Precipitation

Why It Matters

The Los Angeles, California, skyline at dusk reveals unhealthy levels of air pollution.

What are some approaches that urban areas can take to improve air quality?

CASESTUDY

Learn more about the effects of air pollution in the case study The Health Effects of Ground-Level Ozone on pages 310–311.

AirChapter 12

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