Spatial distribution of BC sources from mobile measurements

Gustavo Olivares(a.k.a. Guy Coulson)

National Institute of Water and Atmosphere Research

Outline

• Why?

• Campaign description

• Method

• Results

• Conclusion

Why?

• Identify Traffic vs. Residential Wood Combustion (RWC) emission areas– Enable emission density estimates– Highlight target areas for campaigns,

measures, etc

Campaign description

• Woodburning Emission Dispersion in Glen Eden (WEDGE) … deja vu anyone?

• MAQS2 based campaign– BC– CO2– GPS

(simple) Method

• Ratio for RWC emission factors is about 3 times larger than the same ratio for traffic

• Ratio between BC and CO2

Results CO2 [ppm]

Results BC [ng/m3]

Results BC / CO2

0%

2%

4%

6%

8%

10%

12%

0 5 10 15 20 25 30 35 40 45 50 55 60 65 70 75

BC / CO2

Fre

quen

cy

~ 3 times higher ratio for RWC

Source mapping

Source mapping

Source mapping

Conclusions

• BC / CO2 ratio is useful to discriminate between traffic and residential combustion sources

• Mobile measurements of these pollutants can effectively map the emission areas

• Could this be used for point measurements screening?