SECONDARY ORGANIC PARTICLES FORMATION FROM OZONE-TERPENES REACTION: A CASE STUDY IN A RESIDENCE OF A MEDITERRANEAN CITY

The aim of the present study was to Investigate secondary particles formation from ozone-terpenes reaction in an apartment situated in a suburban area of Athens which is characterized by high ozone levels The experimental campaign took place in separate days in October 2008 and scheduled scenarios of terpenoid-containing products use were followed Continuous ozone and particle number (14 different size channels from 0 3 to 20 mu m) measurements were conducted Additionally, morning, afternoon and evening VOC's sampling took place indoors and outdoors The results indicated that benzene, toluene, octane, p,m-xylene, o-xylene and 1,2,3- trimethylbenzene are considerably influenced from traffic emissions D-limonene indoor concentration levels were mainly influenced by cleaning and spraying activities Regarding biogenic VOC's, d-limonene and b-pinene were produced after 4 hours of cleaning but 6 hours after activity's end (evening measurement) concentration returned to background levels Furthermore, in case of combined activities limonene levels increased and remained higher than background ones for a longer period Finally, there is a clear connection between ozone morning increase, emissions from terpenoid-containing products and smaller (<0 65 mu m) particles production The most rapid increase in particles concentration was noticed during the day of spraying-scenario On the other hand, during the cleaning-scenario day there was a 2-hour delay and lower increase