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| Q.77 | What does AQI signify? | |
| Ans | 1. It indicates the colour of the air. | |
| 2. It is a measure of how air pollution affects one’s health within a short time period. | ||
| 3. It predicts ozone levels in your area. | ||
| 4. It determines the intensity of sound and sound pollution. |
Correct Ans Provided: 2
