Dive summary:

• Meeting a court's order to make a decision, the Environmental Protection Agency issued rules that will reduce how much fine particulate matter can be in the air, and that rule's effect on diesel-engine emissions could affect contractors who buy them.
• Diesels and power plants that burn coal are generally thought to be where EPA can squeeze out the fine particles, which are referred to as PM 2.5 and are defined as ones 2.5 micrometers in diameter or less.
• Associated General Contractors said an important victory for the construction industry was EPA's decision to grandfather pending preconstruction permitting applications.

From the article:

EPA estimates that the annual costs of implementing the new annual PM2.5 standard are between $53 million to $350 million. ...