Indoor Air Quality and Personal Exposure Assessment Program

This page updated March 6, 2003.

Summary of SB 25 Indoor and Personal Air Monitoring Study


The SB 25 indoor and personal air monitoring study is a companion to the SB 25 Air Resources Board (ARB) outdoor monitoring project underway in selected communities of California. The goal of the overall project is to measure concentrations of air pollutants where children spend a significant amount of time, to facilitate the assessment of how well the statewide monitoring network reflects children's exposures.

For this project, air monitoring equipment was placed inside classrooms and operated for one week at a time during school hours. An additional set of monitors collected outdoor air samples on the school ground where students spend time. Another set of samplers operated inside one student's home for a 24-hour period during the week.

An additional aspect of the study involved direct student participation. Students in one or two classrooms at each school wore a small monitoring badge clipped to their shirt or blouse for two days. The badge measured exposure to volatile gases everywhere the student went. Students from some classes completed a questionnaire about any asthma and allergies they may have. Student and parent consent forms were signed prior to participation in this part of the study.

Purpose of Project

  • Obtain measurements of students' indoor and personal exposures to air pollutants in three communities to help determine whether the current outdoor monitoring system adequately reflects the exposures of children to air pollutants.

  • Assess the health status (asthma and allergies) of students at each site.

  • Meet requirements of SB 25 passed in 1999, which requires the Air Resources Board to conduct indoor and outdoor sampling, and personal exposure measurements in each community.  

Community Locations

  • Boyle Heights (Los Angeles Area) - Hollenbeck Middle School

  • Wilmington (Los Angeles Area) - Wilmington Park Elementary School

  • Crockett (Northern California) - John Swett High School

Monitor Siting in Each School

  • Indoors in Three Classrooms Per School

  • One Outdoor Site on School Grounds or Near School

  • One Student Residence Near School

Pollutants Measured

  • Particulate Matter

  • Elemental Carbon and Organic Carbon in Particulate Matter

  • Volatile Organic Compounds (VOCs) (Small Badges for Organic Gases)

  • Formaldehyde

  • Carbon Monoxide

  • Metals

Scope of Personal Monitoring

  • 25 to 50 Students Per School

  • Wear passive badge clipped to collar or shirt for two days.

  • One Time Only, No Repeat Monitoring, Volatile Gases Only

Health Status Survey of Students

  • Determine incidence of asthma and allergies in subset of student population by questionnaire.

  • Survey the students in classrooms with indoor monitoring.

Public Outreach

  • Staff Available to Answer Questions from Parents, Students and Teachers

  • Handout Material Provided on Reducing Exposure to Pollutants

  • Sponsor informational meetings prior to monitoring and at end of project to relay results.


Indoor Program

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