png AER,BC,BCPOM,DMS,DUST,METEO,POM,SO2,SO4,SS ANGSTROM,AVE,BUD,CHEAQP,CHEGP,CHEP,CONC1000,CONC500,CONCZON,DRY,EC550ZON,EMI,EMICHEP,LOAD,LOAD05,LOAD05D,LOAD125,LOAD125D,LOADCOA,LOADCOAD,LOADD,MEC550,OD550,OD550D,OD865,OD865D,PREC,RH1000,RH500,RHOPTD,SCONCD,SED,SEDDRY,WET an2000,an2001 mALLYEAR ps