The Smallest Things Have the Biggest Impact: Particles in your lungs and your community. Sacramento April 25, 2005 Thomas A. Cahill, Member, Health Effects Task Force (HETF), American Lung Association – Sacramento Emigrant Trails (ALASET) Professor, Physics and Atmospheric Sciences and Head, DELTA* Group, UCD

What is the ALA-SET Health Effects Task Force? Formed in 1994 Modest grants to ALA-SET from Sacramento Metropolitan AQMD, Norm Covell, and Yolo Solano AQMD, Larry Greene Jan Sharpless, Chair; Betty Turner, ALA-SET coordinator Typically 8 volunteers Presently UC Davis (2), Sac Public Health, ARB, DHS (2), SMAQMD, Sierra Research, an MD, and ALA statewide, with ALASET, Project Clean Air, and High School Environmental Assessment Project liaison, plus DHS and Kaiser Permanente collaborators Access to sampling equipment, sampling sites, & analysis

ALA-SET HETF Particulate Studies; particles in the fine (< 2.5μm), very fine (< 0.25 μm), ultra-fine (< 0.1 μm) modes Stroke and ischemic heat disease mortality vs air quality, Central Valley of California 1998 Sacramento I-5 aerosol transect Phase 1, Sacramento I-5 aerosol transect Phase 2, High School air quality evaluations 2005

PM 10 PM 2.5 PM 0.25 ? C TSP (pre- 1987)

Particulate Matter in the Atmospheric The Atmospheric Aerosol Total Suspended Particulate mass TSP < 35 μm Inhalable Aerosols PM 10 < 10 μm Fine Aerosols PM 2.5 < 2.5 μm Very fine aerosols, < 0.25 μm, ultra fine aerosols, < 0.10 μm 35 to 10 μm, mostly natural Dust, sea salt, pollen, … 10 to 2.5 μm, largely natural Dust, sea spray, some nitrates 2.5 to 0.25 μm, mostly man made Fine dust, nitrates, sulfates, organics, smoke 0.25 to circa 0.01 μm, almost entirely man made; high temperature combustion, heavy organics, soot, metals Deep lung deposition

Why were these HETF studies initiated? New information became available CORE Report on IHD and stroke death rates New PM 10 data in California after 1987 U. Minnesota/DRI/DELTA Group diesel studies Tuscarora tunnel studies Gertler et al HEI 2002 U. Minnesota truck emissions Watts/Zielinska/Lawson 2002 Local information was lacking Near roadway concentrations New techniques became available Sampling DELTA Group DRUM sampling technology NSF ACE-Asia samplers became available Analysis Soft beta mass at UCD, S-XRF analysis at LBNL

Spatial patterns of Ischemic Heart Disease mortality versus PM 10,

Health Impacts of Valley Aerosols For winter, 120 ug/m 3, r 2 = 0.69

Central Valley PM 10 aerosols…

Are almost all fine PM 2.5 aerosols in winter…..

and Sacramento is only marginally better for fine particles…..

Wind Bay Area to Bakersfield Wind Bakersfield to Bay Area Rain 3 mm Cold, down-slope Hot, up-slope Here there be cows

Health effects of aerosols Statistical certainty that fine PM 2.5 mass correlates well with death and illness Example: Dockery et al 1994; ALASET HETF Study, 1998 Theoretical analysis, animal and laboratory studies show most PM 2.5 mass is harmless in ambient levels Causal components of PM 2.5 that are harmful – uncertain; best candidates? (Devlin EPA 2003) Acidic aerosols Biological aerosols Fine Transition metals Very fine/ultra fine insoluble particles High temperature organics

Sacramento – I-5 Transect Studies: 2002 – 2003 and ; New data from DELTA Group collaborations Laboratory studies – NREL/U. Minnesota/DRI diesels; UCD S-XRF analysis –(Lawson, Watts, Zielenska et al.), plus DRI Lube oil (Fujita) Prior field studies – prior ARB/UC Davis work; HEI/DRI Tuscarora Tunnel (Gertler et al 2002) Quasi-ambient and ambient ALASET - HETF applications Interstate 5 and downtown Sacramento Downwind of Watt Avenue

U. Minn. Dynamometer Diesel tests Fuel Lube oil

U. Minnesota Dynamometer Diesel Tests Lube oil

PM 2.5 PM 0.25 ? PM 10 Average Zn to mass, all DRI tests, 1800  1300

Highway emissions Laboratory tests have proven useful for process but unreliable in on highway tests Highways studies are of two major types – Lateral transverse studies Tunnel studies Highway studies are hard and expensive – Define traffic and meteorology Measure vast numbers of gasses and particles over a short periods of time

Now cars are becoming the largest component of toxic very fine aerosols

Comparisons of trucks and cars from the Tuscarora Tunnel study ParameterDiesel Trucks (mg/km) Cars (mg/km) RatioComment PM 2.5 mass Mass? Truck PM 10 = 181 PM 2.5 OC nd biggest ratio PM 2.5 EC biggest ratio PM 0.25 Znna  10 < 0.25 μm PM 0.25 Cuna  10 < 0.25 μm Heavy organicslargeA few out of 92 PM 2.5 NH 3, S< ; Some S in gasoline Gasses(g/km) CO Roughly fuel mileage CO< < 0.3 NO (as NO 2 ) rd biggest ratio THC

New techniques and NSF ACE-Asia samplers: DELTA Group 8 DRUM Impactor 8 size ranges: Inlet ( ~ 12) to 5.0 μm 5.0 to 2.5 μm 2.5 to 1.15 μm 1.15 to 0.75 μm 0.75 to 0.56 μm 0.56 to 0.34 μm 0.34 to 0.26 μm 0.26 to 0.09 μm 10.4 l/min, critical orifice control, ¼ hp pump 6.5 x 168 mm Mylar strips For 42 day run, 4 mm/day, time resolution = 1 hr. Field portable 10 kg, 43 × 22 × 13 cm 43 cm

Example of very fine 0.26 > Dp > 0.09 μm particles from near Highway 50, South Lake Tahoe

Typical DELTA Group ALS S-XRF x-ray spectrum taken at a clean site in 30 sec

Study and date MethodsAverage ratio, Al to Fe Std. dev.Average ratio, Cu to Pb Std. dev. BRAVO, 1999 PIXE vs S-XRF FACES, 2001 ARB XRF vs S-XRF FACES, 2001 ARB RAAS vs S-XRF ARB LTAD 2005 DRI XRF vs S-XRF All prior studies Average (no RAAS) (0.985) 0.15 (0.11) (1.055) (0.076) Quality assurance tests of the DELTA Group S-XRF analyses through 3 rd party comparisons

Note: The DRUM sees almost twice as much soil elements as Dichots and the RAAS, partially associated with the anomalous soil size at Fresno and the much sharper DRUM size cuts.

DRUM S-XRF vs ARB XRF and ARB RAAS note: it takes 24 6 hr 6 size cuts S-XRF measurements to match a single 24 hr PM 2.5 filter

Lung Assoc. Sacramento Transect Study Site Map and PM 2.5 aggregated data #1, #3 - light blue = rain, yellow = “clear”, rest = fogs, wet and dry I-80 I-5 I-80 Hwy-50 Hwy-99

Figure 8 Map of Downtown Sacramento sites. Crocker Art Museum ARB Site Sacramento River Site

Very fine aerosols are highest next to I-5 in Sacramento

Predicted mass from DRI data 4.8 ±3.2 μ g/m3 Predicted vf mass from DRI data 7.2 ±5.0 g/m 3

Measured mass 6 ± 2 μg/m 3 Measured mass 25 ± 15 μg/m3

Ground level air motion

Why is downtown Sacramento bathed in very fine (and presumably ultra-fine) diesel/smoking car exhaust on those days?

Effect of roadway distance and configuration on downwind concentrations of lead (Cahill et al, ARB 1974) 1. RoadwayDistance27 m40 m100 m160 m At gradeCalculated4.0 * * not scaled! At gradeMeasured DepressedMeasured ElevatedMeasured (2 sites) (3.5) (one site) The wind was blowing directly across the raised WX (I-80 business) freeway

We also see very fine aerosols characteristic of diesels/smoking cars at Fresno; effect of Hwy 99? Predicted diesel vf/uf mass 11/25 – 12/17, 9 ± 6 µg/m 3

We can now measure mass directly by soft beta ray transmission from the DRUM strips

Measured total very fine mass, 8.8 ± 2.0 μg/m 3, vs. predicted diesel/smoking car mass, 9 ± 6 μg/m 3

Aerosol Information from DRUM particle size analysis shows the presence of very fine particles

Study of ultrafine particles near a major highway Zhu et al (2002); Lead from Cahill et al (ARB, 1974) CO, Pb - cars BC, number - diesels Nearest freeway 3 miles

Fine particulate pollution in Sacramento; What did we learn? Sacramento, Fresno, and Los Angeles are impacted by very fine/ultra fine diesel and smoking car aerosols even at distances well away from roadways. Most serious problem – effect of arterials on schools, hospitals, nursing homes… Sac. Amer. Lung Assoc bill (Oct, 2003) requires and air quality evaluation of any school < 500 ft Sacramento is severely impacted by the San Joaquin Valley and Hwy 99 aerosols in winter I-5, the W-X Freeway, and other major roadways are sources of the most worrisome (Devlin, EPA, 2003) types of particles over large areas of Sacramento Very fine high temperature organics, metals, and soot The ALASET HETF, with modest funding, was able to execute a transect of a major urban region with unparalleled detail.

What does the HETF propose? Initiate the process to make car exhaust a Toxic Air Contaminant (TAC) like diesel Diesel by itself is 70% of all the cancer risk from all TACs combined, and car exhaust may be worse per unit mass Initiate actions to remove the gross emitting cars and trucks off California highways Only a few percent of each generate more that ½ of all roadway pollutants Note that even if 2/3 of the cleanest California vehicles became Zero Emission Vehicles, there would be little change in total highway pollution if we haven’t addressed the gross emitters.

What does the HETF propose? Initiate actions to have California adopt a new very fine particle mass standard directly designed to address these very fine and ultra fine particles The most toxic components almost all lie in particles below roughly 0.30 μm to 0.15 μm diameter Development of mitigation strategies – At the source (see above) Transport from sources to receptors (road design, buffer spaces (viz. schools > 500 ft), vegetation barriers,…) and receptor mitigation strategies (air intake options, indoor HEPA filters, plants, low indoor emissions…)

What next for ALASET HETF? High School Environmental Assessment project New ALASET and HETF collaboration with local high school students Self evaluation of local air impacts at three high schools Mira Loma Luther Burbank Davis Loan of UC Davis DELTA Group equipment Includes very fine/ultra fine aerosols by mass and composition Joint analysis of air samples by size, time, and composition (with ALASET HETF funding) Development of a “template” for wide use in high schools

Mira Loma students with ALASET coordinator (Shelley Mitchell, at left), and DELTA 3 DRUM air sampler (middle on bench)

Fine particulate pollution; Where can you learn more? UC Davis DELTA Group web site California Air Resources Board.. ADAM Sacramento Emigrant Trails chapter of the American Lung Association (916) Sacramento Metropolitan and Yolo-Solano AQMDs We deeply appreciate that the last two organizations funded this work.

Thank you “We have work to do” Ref: Sauruman, in Lord of the Rings, The Two Towers