Date:  7 Dec 1995________
 Time Sent: 10:45E Summer ________
 Reported by: John Gras_____________
 
 
 
 CHECK IF                      COMMENTS/
 OPERATIONAL                   CUT TIME OFF-LINE
 ------------                  -------------------
 
 
 YES  CN, TSI 3020
 
 YES  Static thermal gradient CCN Counter     
 
 YES  Continuous record of CCN at 0.5%
 
 YES  PMS ASASP-X
 
 YES  TSI 3071
 
 YES   Particle number size distribution using an UDMPS 
 
 YES   TDMA measurements of hygroscopic growth
 
 YES  Light scattering & backscattering fraction, 2 nephelometers
 
 NO   Ammonium to nss sulfate molar ratio using thermal cond. ----->not included
 
 YES  Magee Scientific Aethalometer
 
 YES  TSI 3760 CN counter Gras
 
 YES  Hivol, PM10
 
 YES  Size selected filter stack
 
 NO  SO2 Saltzman
 
 YES   NH3 Whung, AOML
 
 YES  DMS, automated gas chromatography
 
 YES  Radon (222)
 
 YES  Spectral optical depth
 
 YES   Aerosol chemical composition using mass spectrometry 

 YES   Daily MOUDI samples
 
 YES  Six-stage hi-vol cascade impactor Sievering
 
 YES  Bulk filter concentrations every three hours
 
 YES  NOx, NMHC, O3
 
 YES  Peroxides and aldehydes
 
 YES   Stable sulfur isotopes
 
 YES  Single particle analysis using TEM/SEM/EDXA
 
 YES   Single particle analysis using MassSpec
 
 YES   APS

 YES  ISS -operational
After a period of non-baseline in the morning we had a return to baseline conditions with low radon, around 30 mBeq m-3 and CN concnetrations 500-600 cm-3. Size distributions were quite different to the previous days however with a much reduced concentration of large particles. There was also a significant change to more volatile particles. One new instrument was added to the complement yesterday when at 0300 summer time the DRI instrument was brought back to life. No other changes in instrument status since the previous report.