| The recent rule | Primary/ Secondary | Indicator | Averaging Time | Level (µg/m3) | Form |
| 2012 | primary and secondary | PM2.5 | annual | 12 | annual arithmetic mean, averaged over 3 years |
| annual | 15 | annual arithmetic mean, averaged over 3 years | |||
| 24-hour | 35 | 98th percentile, averaged over 3 years | |||
| PM10 | 24-hour | 150 | not to be exceeded more than once per year on average over a 3-year period |