Update of EEAs Core Set Indicator 004 19 th EIONET Workshop on
Air Quality Bern, 30 th September 2014 Alberto Gonzlez Ortiz
Project Manager AQ data and policy assessments European Environment
Agency
Slide 2
CSI004: current assessment description 2 Exceedance of air
quality limit values in urban areas
Slide 3
CSI004: need of update 3 EU Air policy review: New policy
context New scientific studies Increased use of the indicator :
Country level (air pollution country fact sheets) Underestimation
of NO 2 population exposure (WHO, countries) Title
Slide 4
CSI004: indicator specification changes 4 POLLUTANTS PM 10 ; NO
2 ; O 3 ; SO 2 DEFINITION % population potentially exposed above
LT/TV METHODOLOGY (Sub)urban background stations Stations averaged
over the city: classification by city Number of exceedances:
several classes CURRENT CSI004 NEW CSI004 + PM 2.5 ; B(a)P + %
population exposed above WHO guidelines + (Sub)urban traffic
stations Station by station: classification by station Percentiles:
only above or below
Slide 5
CSI004: current methodology 5 X X X Background average
Slide 6
CSI004: proposed methodology 6
Slide 7
7 810 000 = 900 000 90 000 30 000 each 405 000 each
Slide 8
CSI004: (new) uncertainties 8 Existing ones: station
classification; not all the urban population is taken into account;
the year-to year changes (meteorological variability; the number of
available data series; the geographical coverage of stations) The
representativeness of each station is not taken into account.
Traffic and background stations are unevenly distributed
Simplifications People living closer than 100 m to major roads are
the ones exposed to traffic concentrations All cities in a country
same percentage Percentages remain constant
Slide 9
CSI004: new assessment visualization 9 + information on B(a)P
and SO 2 + graphs with the 10 th and 90 th percentiles and the
average of: a)The PM 2.5 annual mean concentrations. b)The P90.4 of
the daily PM 10 concentrations c)The P93.2 of the maximum daily 8
hours mean O 3 concentrations d)The NO 2 annual mean
concentrations