Higher exposure to fine particulate matter, nitrogen dioxide, and ground-level ozone was associated with increased asthma incidence in children up to age 10, according to a new study funded by the Environmental influences on Child Health Outcomes (ECHO) Program at the National Institutes of Health. Notably, children living in areas with higher proportions of Black residents or higher population density faced greater pollution-related asthma risk, despite overall air quality improvements in the U.S.

“Our findings show why it’s so important to keep reducing air pollution everywhere in the U.S. They also highlight the need to understand and tackle the deeper reasons why some communities are more affected than others,” said Veronica Wang, research fellow at the Harvard T.H. Chan School of Public Health.

Key Takeaways:

• Higher levels of fine particulate matter, nitrogen dioxide, and ground ozone were each linked to more new cases of asthma in early childhood.
• Fine particulate matter and nitrogen dioxide posed a greater asthma risk for children living in areas with more Black residents.
• Children in more densely populated neighborhoods were also at higher risk from these pollutants.
• The study looked at data from over 23,000 children born between 1981 and 2021 to find out which groups are more likely to develop asthma from air pollution exposure in early childhood.

The study analyzed extensive environmental and community data, highlighting the importance of reducing harmful exposures in the most affected neighborhoods.

This collaborative research was published in Environmental Epidemiology.