The most recent RGGI quarterly auction (Auction 59) was held on March 8, 2023. The clearing price was $12.50/ton, 3.8% lower than the clearing price of $12.99/ton on December 7, 2022 (see Figure 1). Auction 59 represents the third consecutive auction with a clearing price at least three percent lower than the previous auction. The trend of lower clearing prices in recent auctions is notable given that clearing prices had increased in 12 consecutive auctions from September 2019 through June 2022.

The U.S. Environmental Protection Agency (EPA) issued a proposed rule to strengthen the primary (health-based) annual National Ambient Air Quality Standards (NAAQS) for fine particle pollution, PM2.5. Specifically, the EPA is proposing to revise the primary annual standard from 12.0 µg/m3 to a value within the range of 9.0 and 10.0 µg/m3.