Public Workshop on Updating the Indoor Air Quality Guidelines for Nitrogen Dioxide - Submit Public Comments Back To Public Comments Categories Topics Indoor Air Quality & Exposure Programs Indoor Air Contact Email helpline@arb.ca.gov The California Air Resources Board invites you to submit comments regarding the workshop discussions and possible updates to guidelines for indoor exposures to NO2.. Submit your comments Deadline for Submittals - May 16, 2023 to May 26, 2023 Status message Thank you for your interest, the public comment period has now ended. Should you have any questions or concerns regarding these comments, please use the Contact link on this page. Leave this field blank