Daily Activity Patterns and Time Spent for Exposure Assessment:

Abstract

Recently in the field of personal exposure studies, the individual daily activity and time spent have been greatly concerned. The information about daily activity and time use patterns provide benefit on the analysis of environmental pollutant within microenvironment. Comprehensive studies for daily activity with time spent as a basis for estimates of personal exposure have been conducted few times in Korea. The primary objective of this research, therefore,is to present activity patterns and time spent of individuals especially for University students. University campus is unique area where students decide activities and spend time respect to them on campus. This activity and time spent will be a basis of estimating number of activity population by time of day at a certain building or place on campus. Activity population estimated will help to assessment individual exposure in micro-environmental pollutants. The Dongnam University conducted a student activity survey. A random 500(10%) students, sample of students representing the total Dongnam University student population, was selected and they were asked to complete a activity diary for one school day between April 4 and 30, 2012. The questions included demographic information and activity-time use patterns. The activities consist of 7 major classifications: Work(class, lab, etc), Study(personal), Excise, Recreation, Club, Other, and Travel. We focus on the school hours from 6AM to 24PM and present the statistics of activity frequency, duration, and travel time by activity patterns. Further, based on the activity-time spent data, we develop activity profile by hourly segmentation at individual building level on campus and construct a statistical model for estimating activity profile. This will be basis of estimates of activity population for exposure at environmental pollutant. Findings will indicate whether theactivity-time spent estimates have great potential of personal exposure studies with indoor pollutant.