| The New Dictionary of Cultural Literacy, Third Edition. 2002. |
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| Air Quality Index |
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| A measure of the quantity of harmful particles and chemicals in the air. | 1 |
| ‡ The index is used by weather forecasters to indicate the purity of the air on a given day. The higher the index, the smoggier (see smog) and more polluted the air. | 2 |
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| | | The New Dictionary of Cultural Literacy, Third Edition. Edited by E.D. Hirsch, Jr., Joseph F. Kett, and James Trefil. Copyright © 2002 by Houghton Mifflin Company. Published by Houghton Mifflin Company. All rights reserved. |
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