U.S. Code of Federal Regulations
Regulations most recently checked for updates: Oct 07, 2025
The following table presents the latest dates by which the national standards are to be attained. These dates reflect the information presented in Rhode Island's plan, except where noted.
| Air quality control region | Pollutant | |||||
|---|---|---|---|---|---|---|
| SO | PM | NO | CO | O | ||
| Primary | Secondary | |||||
| Rhode Island portion of AQCR 120 (Entire State of Rhode Island) | (a) | (b) | (a) | (a) | (a) | (c) |
a Air quality levels presently better than primary standards or area is unclassifiable.
b Air quality levels presently better than secondary standards or area is unclassifiable.
c November 15, 2007.
