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Joint EMEP/WGE meeting, Geneva, 2016 Evaluation of B[a]P pollution in the EMEP region: temporal trends and spatial variability Alexey Gusev, Olga Rozovskaya, Victor Shatalov Meteorological Synthesizing Centre - East
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Joint EMEP/WGE meeting, Geneva, 2016 B[a]P emissions have increased in the past decade as a result of an increase of emissions from domestic combustion (Guerreiro et al., 2015, 2016; EMEP Status Report, 2015) In 2013 about half of B[a]P monitoring stations (mostly urban/suburban) in Europe continued measuring air concentrations above the EU target level 1 ng/m 3 (EEA report, 2015) D omestic combustion of wood/coal for heating is linked to adverse health effects, especially in urban and sub-urban areas where emissions and population densities tend to be higher (Guerreiro et al., 2016) B[a]P pollution in the EMEP region: background information
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Joint EMEP/WGE meeting, Geneva, 2016 Long-term trends of B[a]P pollution in the EMEP countries (1990-2012) Modelled B[a]P air concentrations (EMEP) Annual B[a]P emissions (EMEP) B[a]P emissions and air concentrations decreased from 1990 to 2001 by ~30% Reduction 36% Reduction 31% No reduction of emissions and air concentrations is seen from 2002 to 2012 No reduction Some of the EMEP countries are characterized by slight increase of B[a]P concentrations in period 2005-2012 Analysis of trends 0 200 400 600 800 199019921994199619982000200220042006200820102012 B[a]P emissions, t/y Value Trend 0 0.03 0.06 0.09 0.12 0.15 199019921994199619982000200220042006200820102012 B[a]P in air, ng/m 3 Value Trend
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Joint EMEP/WGE meeting, Geneva, 2016 Countries with stable or increasing B[a]P concentrations in 2005-2014 (modelled data) Moldova114% United Kingdom56% Spain53% Croatia38% Iceland24% Poland13% Germany8% Italy6% Belarus5% Portugal5% Slovakia 5% Bulgaria3% Long-term trends of B[a]P pollution in the EMEP countries (1990-2014) Increase of B[a]P emissions from 2005 to 2014 (official data)
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Joint EMEP/WGE meeting, Geneva, 2016 Modelled B[a]P air concentrations Annual B[a]P emissions Belgium Long-term trends of B[a]P pollution in the EMEP countries (1990-2014) Poland 0 10 20 30 40 50 60 1990199219941996199820002002200420062008201020122014 Emissions, t/y 0.0 0.3 0.6 0.9 1990199219941996199820002002200420062008201020122014 B[a]P in air, ng/m 3 ValueTrend Poland 0 5 10 15 20 25 1990199219941996199820002002200420062008201020122014 Emissions, t/y B[a]P in air, ng/m 3 Belgium 0.0 0.5 1.0 1.5 2.0 2.5 1990199219941996199820002002200420062008201020122014 ValueTrend
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Joint EMEP/WGE meeting, Geneva, 2016 Assessment of B[a]P pollution in EMEP countries Modelled annual mean B[a]P air concentrations Modelling results reasonably agree with measurements of B[a]P concentrations at rural/background stations (2013-2014) Model vs. rural/background sites (EMEP, AirBase) MOD = 0.73 OBS R corr = 0.6 F2 = 51% 0.01 0.1 1 10 100 0.010.1110100 Observed, ng/m 3 Modelled, ng/m 3
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Joint EMEP/WGE meeting, Geneva, 2016 Assessment of B[a]P pollution in EMEP countries Modelled annual mean B[a]P air concentrations (range: <0.1 – 6 ng/m 3 ) Measurements of B[a]P concentrations at background urban/suburban sites (range: <0.1 – 16 ng/m 3 ) Modelling results vs. measurements of B[a]P air concentrations at background urban and suburban stations (EEA Airbase, 2013)
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Joint EMEP/WGE meeting, Geneva, 2016 Model vs. background urban/suburban sites (AirBase) MOD = 0.17 OBS R corr = 0.6 F2 = 20% Underestimation of B[a]P pollution in urban areas Modelling results provide smoothed levels of concentrations and do not capture sharp gradients observed in urban areas 0.01 0.1 1 10 100 0.010.1110100 Observed, ng/m 3 Modelled, ng/m 3 Modelled annual mean B[a]P air concentrations
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Joint EMEP/WGE meeting, Geneva, 2016 A study of B[a]P pollution in urban areas Objectives: Estimate B[a]P pollution levels in urban areas including their spatial distribution to provide information for exposure studies Analyze contributions of various emission sources and major source categories to B[a]P air concentrations Methods: Nested modelling of B[a]P pollution levels for the area in Central Europe with elevated B[a]P air concentrations (the Czech Republic, Poland, Slovakia,…) Regression analysis to determine relationship between measured urban concentrations and modelling results, emissions, meteorological variables Further activity: Refinement of the approach and application for other EMEP countries in co-operation with national experts
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Joint EMEP/WGE meeting, Geneva, 2016 Assessment of B[a]P with fine resolution EMEP domain, 50 x 50 km 2 Annual mean modelled B[a]P air concentrations for 2013 Fine resolution domain, 5 x 5 km 2 Measurements selected for the analysis: data of background urban/suburban sites from EEA/Airbase (23 sites) fulfilling criteria of temporal coverage (>75%) Selected modelling domains with coarse and fine spatial resolution Ostrava Prague
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Joint EMEP/WGE meeting, Geneva, 2016 Assessment of B[a]P with fine resolution EMEP domain, 50 x 50 km 2 Annual mean modelled B[a]P air concentrations for 2013 Measurements selected for the analysis: data of background urban/suburban sites from EEA/Airbase (23 sites) fulfilling criteria of temporal coverage (>75%) Selected modelling domains with coarse and fine spatial resolution domain Fine resolution domain, 5 x 5 km 2
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Joint EMEP/WGE meeting, Geneva, 2016 Modelling results for background urban/suburban sites Modelling results vs. EEA/AirBase measurements for 2013 Modelling results indicate B[a]P concentrations near or above 1 ng/m 3 for some of the sites In general, measured concentrations are underpredicted by the model especially in the Ostrava region Modelled B[a]P concentrations (5x5 km 2 ) Modelled vs measured concentrations for Czech Republic
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Joint EMEP/WGE meeting, Geneva, 2016 Regression model to estimate urban concentrations Multi-parameter regression analysis to determine relationship between observed urban/suburban concentrations, modelling results and additional parameters: j- urban/suburban monitoring site j C obs,j - B(a)P air concentrations observed at site j Var j - variability of modelled concentrations near corresponding grid cell C mod,j - modelled B(a)P concentration in the corresponding grid cell E ind, E res, E rot - emissions of B(a)P from major source categories W av,j - average wind speed in the grid cell w j - residual component a, b ind, b res, b rot - multiple-regression parameters. Variability of modelled B(a)P concentrations near the corresponding grid cell is estimated using 9-gridcell moving matrix: Var j = C max / C min
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Joint EMEP/WGE meeting, Geneva, 2016 Preliminary results of regression analysis ModelledRegression RelBias 60%0.01% NRMSE 85%41% F2 39%96% Corr 0.520.79 Application of regression model permits to obtain generally good agreement with measurements in urban areas of the Czech Republic Regression model results vs. EEA/AirBase measurements for 2013 (background urban/suburban sites) Regression model results applied for urban areas
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ng/m 3 Spatial distribution of B[a]P concentrations Estimation of spatial distribution of B[a]P concentrations in urban areas based on regression model results for selected monitoring sites Combined map of B[a]P air concentrations ng/m 3 Regression model results for urban areas EMEP model results
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Joint EMEP/WGE meeting, Geneva, 2016 Combined map of modelled B[a]P air concentrations (5x5 km 2 ) and regression model results for 2013 Source: Graphic Yearbook for 2013 (CHMI report) Estimates of B[a]P pollution of the Czech Republic Estimated B[a]P concentrations for urban areas in comparison with data published by Czech Hydrometeorological Institute (CHMI) ng / m 3
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Joint EMEP/WGE meeting, Geneva, 2016 Transboundary transport of B[a]P between EMEP countries Long range transport from external (non-CZ) emission sources can significantly contribute to the pollution of areas near the country borders Non-CZ sources: 30-60% Contribution of non-CZ emission sources to B[a]P air concentrations Regression model results vs. EEA/AirBase measurements for 2013 Poland Germany Austria Slovakia
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Joint EMEP/WGE meeting, Geneva, 2016 Implications for further activity Exceedances of EU target value (1 ng/m 3 ) in recent years were indicated for Italy, Poland, Bulgaria, Lithuania, Hungary, … (e.g. Gianelle et al, 2013; Kozielska et al., 2015; Csanádi et al., 2015; …) Available national measurements of the EECCA countries (e.g. Russian Federation) indicate exceedances of the 1 ng/m 3 limit for B[a]P in urban areas WHO estimated reference level for B[a]P 0.12 ng/m 3 is significantly lower than EU target value (EEA SOER, 2015) About 88% of European population lives in areas exceeded WHO estimated reference level (ETC/ACM, 2014 )
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Joint EMEP/WGE meeting, Geneva, 2016 Final remarks B[a]P air concentrations in the EMEP countries decreased from 1990 to 2001, however in recent decade the decline of concentrations is almost leveled off or changed to increase According to measurements/modeling data B[a]P pollution levels in some of the EMEP countries are still significant and exceed air quality standards in areas with high population density To provide information for exposure studies combined approach, based on fine resolution modeling and multiple regression analysis, could be applied for evaluation of B[a]P pollution levels in ‘‘hot spots’’ of EMEP domain.
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