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.
District-specific estimated average growth in FVC (ml/year) in 1993–1996 plotted against district daily average PM2.5 (μg/m3) over 1995–1996. The line is the association between the PM2.5 and FVC growth estimated from the two stage analysis.
