State;
Environmental;
Protection;
Key;
Laboratory;
of;
Urban;
Ambient;
Air;
Particulate;
Matter;
Pollution;
Prevention;
and;
Control,;
College;
of;
Environmental;
Science;
and;
Engineering.;
Nankai;
University,;
Tianjin;
300071,;
China;
Institute;
of;
New;
Energy;
Material;
Chemistry,;
College;
of;
Chemistry,;
Nankai;
University,;
Tianjin,;
China;
有机碳; 元素碳; 天津; PM2.5; 欧盟委员会; 特征; 微粒; 大气;