Indoor and Outdoor Air Indoor and Outdoor Air Pollutants, AQI Values, and Pollutants, AQI Values, and Childhood Asthma Childhood Asthma John L Parker, MSPH John L Parker, MSPH John M. John M. Veranth Veranth , , Ph.D Ph.D University of Utah University of Utah And Many Collaborators And Many Collaborators
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Indoor and Outdoor Air Indoor and Outdoor Air Pollutants, AQI Values, and Pollutants, AQI Values, and
Childhood AsthmaChildhood Asthma
John L Parker, MSPHJohn L Parker, MSPHJohn M. John M. VeranthVeranth, , Ph.DPh.DUniversity of Utah University of Utah
And Many CollaboratorsAnd Many Collaborators
Study BasisStudy BasisPediatrician & School Official Question:Does keeping children indoors on high air pollutant days protect health?• Utah Div. Of Air Quality issues heath advisories
based on Air Quality Index (AQI) and coordinates with the Utah Dept. Of Health and school districts
• Very little peer-reviewed literature supporting the “Stay indoors on high air pollution days”recommendation
RelevanceRelevance• Increasing childhood asthma.• Keeping children inside has health, behavioral, and
social consequences.
Study MethodsStudy Methods
• Indoor and Outdoor Air Quality Monitoring:– Particulate size distribution, mass and composition– Volatile Organic Compounds (VOCs) concentration
and composition• Clinical: Spirometery before and after recess
and health questionaire.
Study Site Study Site -- Hawthorne Hawthorne Elementary School, SLC UTElementary School, SLC UT
Air Quality IndexAir Quality Index
• AQI is composed of:– Ground-level Ozone– Particle pollution
• PM2.5, fine particulates• PM10, coarse particulates
– Measurements recorded twice daily (morning/evening)
– Designed to be easy method to inform public of pollution levels
– AQI based on science, consensus and opinion
Air Quality Index ValuesAir Quality Index Values• No really serious air pollution episodes
0
25
50
75
100
125
1/25/2
006
1/27/2
006
1/29/2
006
1/31/2
006
2/2/20
062/4
/2006
2/6/20
062/8
/2006
2/10/2
006
2/12/2
006
2/14/2
006
2/16/2
006
2/18/2
006
2/20/2
006
2/22/2
006
2/24/2
006
2/26/2
006
2/28/2
006
Air
Qua
lity
Inde
x
AQI - AM AQI - PM
PM 2.5 Vs. AQIPM 2.5 Vs. AQI
• Health recommendations:– Green – Good– Yellow – Moderate– Orange – Sensitive– Red – Unhealthy– Purple – Very
Unhealthy– Maroon - Hazardous
050
100150200250300350400450500
0 100 200 300 400 500
Air Quality Index
PM 2
.5 (u
g/m
^3)
HazardousHazardousVery Very UnhealthyUnhealthy
Unhealthy
Unhealthy
SensitiveSensitiveM
oderateM
oderateG
oodG
ood
ParticulatesParticulates
• Measured Indoors/Outdoors with:– GRIMM aerosol spectrometer model 1.108
• Continuous measurements on 15 bins (0.3 - 20+ µm)– Tapered Element Oscillating Microbalance (TEOM)
• EPA approved• Used for determining correction factor for Grimm PM 3
– Speciation performed:• Indoor samples taken weekly for PM 10 • Outdoor samples taken every 3 days for PM 2.5 • Results averaged daily over study period
Particulate ResultsParticulate ResultsIndoor and Outdoor PollutionIndoor and Outdoor Pollution
Outdoor AirAvg. of 5 Least and Most Polluted days
0.00
5.00
10.00
15.00
20.00
0.1 1 10
Particle Size in Microns
Estim
ated
Mas
s (m
icro
gram
s/m
^3)
Least Polluted Most Polluted
Indoor AirAvg. of 5 Least and Most Polluted days
0.00
0.50
1.00
1.50
2.00
2.50
0.1 1 10
Particle Size in Microns
Estim
ated
Mas
s (m
icro
gram
s/m
^3)
Least Polluted Most Polluted
Least Polluted Most Polluted
Time Trend DataTime Trend Data0.3 to 0.4 Microns0.3 to 0.4 Microns
•VOCs appear to be from indoor sources•No obvious relationship to outdoor pollution
Low Air Pollution High Air Pollution
Study ConclusionsStudy Conclusions
Is Staying Indoors Protective?Is Staying Indoors Protective?• Yes:
– Overall PM is less indoors than outdoors – Indoor school air is protective of submicron sized
particles• Indoor pollutant levels include higher levels of
VOCs– Levels not hazardous, just higher than outdoors– Association of low level VOCs not well understood
• Possible contributing factors to chronic effects such as asthma
Study ConclusionsStudy ConclusionsIndoor Air QualityIndoor Air Quality
• Indoor and outdoor environments differ• Larger indoor particles generated by human
activity• Submicron particles are infiltrating indoors, but
at considerably lower concentrations • VOCs generally present in higher
concentrations indoors than outdoors
AcknowledgementsAcknowledgements
• RR Larson, PhD• EM Wood, MD• HS Kim, PhD• John Veranth, PhD • N Frei, MD• K Buchi, MD• G Warwick, MS• S Packham, PhD• K Perry, PhD• G Smith• R Dalley• B Allen• L Chuy
• In kind support – State of Utah Department of
Environmental Quality, Air Quality Division
– Salt Lake School District– Desert Research Institute – DataChem Laboratories – Rocky Mountain Center for
Occupational and Environmental Health
Financial Support•Primary Children's Medical Center Foundation•NIEHS K25 ES11281