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

CARB’s existing indoor air quality guidelines 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 the World Health Organization's (WHO) indoor guideline for a 24-hour averaging time. These guidelines were one of the first efforts to provide information on safe levels for pollution indoors.
Since then, 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 Health Canada and WHO guidelines for safe levels of nitrogen dioxide are significantly lower than CARB’s guideline levels. This and other examples of updated guidelines from other agencies support the need for a reevaluation of CARB’s indoor air guidelines.
For more information on the Indoor NO2 Guidelines update, visit: ww2.arb.ca.gov/our-work/progr...