Public Workshop #2 on Updating the Indoor Air Quality Guidelines for Nitrogen Dioxide

Announcement
Purpose
Background
Contact
Submit Comments
Presentations & Transcripts
- Recording of Workshop (CARB's YouTube Channel)
- Presentations (PDF)
- Chat Transcript (PDF)
- Q & A Transcript (PDF)

Updating the Indoor Air Quality Guidelines for Nitrogen Dioxide

May 30, 2024 at 9 a.m. PT

The California Air Resources Board (CARB) invites you to participate in our second public workshop discussing potential updates to the California indoor air quality guidelines for NO₂. At the first workshop, international and state health agencies, health experts, and community-based organizations presented information on the importance and need for up-to-date indoor guidelines as well as recent approaches and potential challenges to updating the guidelines. This next workshop will cover CARB’s potential approaches based upon the information presented in the previous workshop.

Public Workshop #2

Date: Thursday, May 30, 2024
Time: 9 a.m. to 11a.m. PT
Location: Zoom Webinar
GovDelivery Bulletin Announcement

Please register for the workshop. After registering, you will receive a confirmation email with information about how to join the webinar by computer or by telephone.

Note: The agenda will be posted ahead of the meeting.

Purpose of Workshop

CARB is evaluating the health evidence and approaches for updating California's indoor air quality guidelines for NO₂ to protect public health. Based on information presented at the first NO₂ guidelines workshop held in May 2023 and previous work by other guideline developing health agencies, CARB has identified possible approaches for updating its indoor NO₂ guidelines. For each approach, we are considering the development of both 1-hour and 24-hour guidelines to cover acute and chronic exposures. CARB will present options, which include developing or adopting scientifically based 1-hour and 24-hour values from existing IAQ guidelines that have undergone public review and analysis or developing new guideline values based on an evaluation of recent scientific literature and health data not previously considered. After the presentation, CARB will open the meeting for comment and discussion. Our objective is to get feedback on the proposed approaches, their relative strengths and weaknesses, technical issues, and input on health protectiveness and feasibility.

Background

CARB’s existing 2005 indoor air quality guidelines for NO₂and other pollutants were developed as part of the 2005 Indoor Air Quality Report to the Legislature. They were based upon CARB’s outdoor standard for a 1-hour averaging time, and WHO’s indoor guideline for a 24-hour averaging time. These guidelines were one of the first efforts to provide information on safe levels for air pollutants indoors. Since the 2005 report, numerous studies have been published about the health effects of NO₂. Other agencies, most notably Health Canada and WHO, have continued to update their indoor guidelines and adopt lower indoor pollutant levels to protect public health. The most recent Health Canada and WHO guidelines for indoor NO₂ levels are significantly lower than CARB’s current NO2 guideline levels and support the need to reevaluate CARB’s indoor air guidelines.

Contact

If you have questions regarding this workshop, please contact Jeffery Williams in CARB’s Research Division at Jeffery.williams@arb.ca.gov.

If you require a special accommodation or need this document in an alternate format (i.e., Braille, large print) or another language, please email Jeff Williams as soon as possible, but no later than ten business days before the workshop. TTY/TDD/Speech to Speech users may dial 711 for the California Relay Service.