Chemistry Reference
In-Depth Information
5
NOx (max)
NOx (min)
NO2 (max)
NO2 (min)
0
Athens
Berlin
Kraków
Lisboa London
Milano Stuttgart
-5
-10
-15
-20
-25
Fig. 3 Comparison of the slope of the trend in NO
x
and NO
2
annual mean concentrations at urban
traffic sites (
green
:NO
x
,
red
:NO
2
.
Source
: AirBase, FMI [
18
])
Table 14 Population weighted exposure to annual mean and 36th highest daily mean levels in
urban and regional background areas in
g/m
3
(
source
: ETC/ACC [
4
])
m
PM
10
annual mean
(
PM
10
36th highest
daily mean
a
(
g/m
3
)
g/m
3
)
City/area
m
m
Athens
36
55
Berlin
22
37
Ko
ˇ
ice
31
51
Lisbon
31
48
London
b
26
39
Milan/N-IT
45/39
83/69
Paris
28
47
Krak´w/S-PL, NE-CZ
49/39
95/71
Sofia
56
96
Stuttgart
20
36
a
If above 50
m
g/m
3
, more than 35 exceedances of the daily mean PM
10
limit value have occurred
b
According to re-notification of 7 May 2010 PM
10
levels at this site are considerably lower
compared to those reported to AirBase, due to changes in the correction model [
19
]
6 Overview of Critical Factors
In the following the critical factors discussed in the chapters above are summarised.
6.1 Natural Factors
The natural factors cover dispersion conditions, which are influenced by climate
and (regional and local) topography, and natural PM
10
sources.
