Figure 4. Percent excess risk per 10 µg/m3 increase in PM2.5 at lag 0 through 3 days for warm (April–September) and cold (October–March) seasons, adjusted for temperature, seasonal trends, and day-of-week.
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.