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Note: The agenda will be posted ahead of the meeting
The California Air Resources Board (CARB) invites you to participate in our third public workshop discussing updates to the California indoor air quality guidelines for NO2.
CARB hosted two previous workshops in which international and state health agencies, health experts, and community-based organizations presented information on the importance and need for up-to-date indoor guidelines, approaches to consider, and potential challenges.
This workshop will cover CARB’s proposed guideline values and the rationale for the approach chosen.
Date: November 19, 2025
Time: 4:00 PM – 6:00 PM
Location: Zoom Meeting
Please register for the Indoor Air Quality Guidelines Update workshop webinar. After registering, you will receive a confirmation email with information about how to join the webinar by computer or by telephone.
Purpose of Workshop
CARB evaluated several approaches for updating California's indoor air quality guidelines for NO2. Based on information gathered at the two workshops, and previous work by other guideline developing health agencies, CARB has identified an approach that is scientifically sound, and that has guideline values that best protect public health, particularly for sensitive receptors. CARB will present the approach selected and the proposed 1-hour and 24-hour values. After the presentation, CARB will open the meeting for comment and discussion. Our objective is to get feedback on the proposed guideline values, and especially how these new values can be messaged and best leveraged by those in underserved communities.
Background
CARB’s existing 2005 indoor air quality guidelines for NO2 and 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 the workshop, please contact Jeff Williams at CARB’s Research Division.
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.
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