Official websites use .gov
A
.gov website belongs to an official
government organization in the United States.
Secure .gov websites use HTTPS
A lock (
) or https:// means you've safely
connected to the .gov website. Share sensitive
information only on official, secure websites.
Change in particulate matter (PM) concentration in the bedrooms of children with asthma. The rooms of the intervention subjects had high-efficiency particulate arrestor (HEPA) air cleaners. The study was conducted in inner-city Baltimore, Maryland. There was substantial and sustained reduction in both of the particulate-matter size ranges (< 10 μm [PM10] and < 2.5 μm [PM2.5]) in the filtered-air rooms. (From Reference 10, with permission.)
