List from Chapter 5

GOOD VISIBILITY: TEN CITIES IN THE UNITED STATES WITH THE HIGHEST PERCENTAGE OF TIME WHEN VISIBILITY IS 10 MILES OR MORE
Visibility is generally best in the Rocky Mountain states where the air is dry and (relatively) clean and cities are widely spaced. However, rapid growth in many of these cities threatens the previously high visibility.

CITY, STATE

1. Tucson, Arizona
2. Las Vegas, Nevada
3. Honolulu, Hawaii
4. Albuquerque, New Mexico
5. Phoenix, Arizona
6. Grand Junction, Colorado
7. El Paso, Texas
8. Helena, Montana
9. Pueblo, Colorado
10. Casper, Wyoming

PERCENTAGE OF TIME WHEN
VIS. IS 10 MI. OR MORE
99.4
99.1
98.6
98.2
98.1
96.3
95.9
94.8
94.2
93.5

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