Please read the following table in Markdown format and then answer the question according to the table. Table cells in one row are seperated by '|', and different rows are seperated by '
'.

Table:
| Index | Ozone, Running 8 hourly mean (μg/m 3 ) | Nitrogen Dioxide, Hourly mean (μg/m 3 ) | Sulphur Dioxide, 15 minute mean (μg/m 3 ) | PM10 Particles, 24 hour mean (μg/m 3 ) | PM2.5 Particles, 24 hour mean (μg/m 3 ) |
| --- | --- | --- | --- | --- | --- |
| 1.0 | 0-33 | 0-66 | 0-88 | 0-11 | 0-16 |
| 2.0 | 34-65 | 67-133 | 89-176 | 12-23 | 17-33 |
| 3.0 | 66-99 | 134-199 | 177-265 | 24-34 | 34-49 |
| 4.0 | 100-120 | 200-267 | 266-354 | 35-41 | 50-58 |
| 5.0 | 121-140 | 268-334 | 355-442 | 42-46 | 59-66 |
| 6.0 | 141-159 | 335-399 | 443-531 | 47-52 | 67-74 |
| 7.0 | 160-187 | 400-467 | 530-708 | 53-58 | 75-83 |
| 8.0 | 188-213 | 468-534 | 709-886 | 59-64 | 84-91 |
| 9.0 | 214-239 | 535-599 | 887-1063 | 65-69 | 92-99 |
Question:
How many different index numbers are there for an ozone, running 8 hourly mean of 66-99?
Answer:
1.0