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.
Contributions of PM10 emission sources: LPS (dark colours), remote (normal colours), local pollution (light colours), unknown (grey), determined in the PCA-MLRA analysis for each day of PM episodes, springs (March–May), summers (June–August), autumns (September–November), winters (December–February) and for the whole years: a 2009 and b 2010
