Laboratory;
for;
Atmospheric;
Chemistry,;
Centre;
for;
Atmosphere;
Watch;
and;
Services;
(CA;
WAS),;
Chinese;
Academy;
of;
Meteorological;
Sciences;
(CAMS),;
China;
Meteorological;
Administration;
(;
CMA;
),;
Beijing;
100081,;
China;
University;
of;
Chinese;
Academy;
of;
Sciences,;
Beijing;
100049,;
China;
of;
Urban;
Meteorology;
(IUM),;
China;
Meteorological;
Administration;
(CMA),;
Beijing;
100089,;
China;
County;
Meteorological;
Bureau,;
Beijing;
101500,;
China;