Boundary-Layer Characteristics of Persistent Regional Haze Events and Heavy Haze Days in Eastern China

Figure 3

Count of consecutive regional haze days between 1980 and 2012 (a); surface conditions during 5 or more consecutive haze days (b) (equalized pressure: EQP, advancing edge of a cold front: ACF, base of high pressure: BOH, backside of high pressure: BAH, inverted trough: INT, and saddle pressure: SAP).

(a)

(b)