US environmental regulators correct a typo in new air quality rules

The US environmental regulators are fixing a small error in new air quality rules that tightened limits on fine particulate matter. This correction clarifies the deadline for states to submit their plans for meeting the new, stricter pollution standards.

This document is a minor correction to a major change. Earlier this year, the US environmental regulators lowered the acceptable level of fine particulate matter in the air, making it harder for many areas to meet federal air quality standards. This correction simply ensures states know when their new compliance plans are due.