1. Impact of VOCs from different sources on surface ozone concentration in summer in Beijing, China Hang Qu

2. Introduction Method Result

3. Introduction VOC Vehicles Gasoline exhaust Gasoline evaporation LPG Diesel exhaust Industry Painting Petrochemical industry Biogenic

4. Method Ambient VOC concentration VOC source profiles and source apportionment Model

5. Ambient conc. of VOC SpeciesMean [μg/m 3 ] i-Pentane11.84 Toluene11.14 m,p-xylene8.54 n-butane6.36 propane6.24 acetylene5.64 benzene5.43 i-butane5.36 ethylene5.18 ethane4.47 Song et al, 2008

6. Source profile and contributions VOC SourceContribution Gasoline exhaust39.7% Gasoline evaporation11.8% LPG11.0% Diesel3.2% Natural Gas4.6% Petrochemical19.9% Painting4.7% Biogenic1.6% Song et al, 2008

7. Model-pure chemistry Environment 298K, 1atm, noon in summer, 40°N 1800 ppb of Methane, 30 ppb of NO X Tracers 10 most abundant VOC and chemicals/radicals in their reaction pathway Reactions Full oxidation pathway for C 2 H 6, C 2 H 4, C 2 H 2, C 3 H 8 General oxidation pathway for hydrocarbon with 4 & 5 carbon atoms General oxidation pathway for Toluene and Xylene

9. Results

10. Beijing NO X sourceBudget(Mg/year)Contribution Agriculture0.00% Industry130669.739.0% Power61197.318.3% Residential16756.75.0% Transportation126290.937.7% MEIC

12. Conclusion With decreasing emission of 10% for gasoline exhaust, gasoline evaporation, petrochemical process and LPG will decrease the ozone concentration for 2.3%, 0.8%, 1.6%, 0.9% respectively. Decreasing petrochemical source is most effective while decreasing the same amount of VOC emitted