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Particle Number Concentration in
the Urban Area of Rome
P. Avino
1
, S. Casciardi
2
, C. Fanizza
1
, M. Manigrasso
1
1
DIPIA-ISPESL, via Urbana 167, 00184 Rome, Italy
2
DIL-ISPESL, via Fontana Candida 1, 00040 Monte Porzio Catone (Rome), Italy

image
Daily trends of particle number
concentration (20-880 nm) and NOx
Hourly averages
0
10000
20000
30000
40000
50000
60000
70000
80000
90000
100000
4/6
4/7
4/8
4/9
4/10
4/11
4/12
4/13
4/14
4/15
Day
#/cm3 (20-880 nm
0
50
100
150
200
250
300
350
400
450
500
550
600
NOx (ppb)
Particles 20-880 nm
NOx

image
Daily trends of particle number concentration
(20-880 nm) and particle-phase PAH
Hourly averages
0
10000
20000
30000
40000
50000
60000
70000
80000
90000
100000
4/6
4/7
4/8
4/9
4/10
4/11
4/12
4/13
4/14
4/15
Day
#/cm3 (20-880 nm
0
50
100
150
200
250
300
350
400
450
500
PAH (ng/m3
Particles 20-880 nm
PAH

image
Daily trend of particle number concentration (20-
880 nm)
.
0
7
14
21
20.9
30
42.9
61.5
88.2
126.3
181.1
259.5
371.8
532.8
763.5
0
100
200
300
400
500
600
700
800
Particle #/cm3
Hour
nm
700-800
600-700
500-600
400-500
300-400
200-300
100-200
0-100

image
Daily trend of radon concentration as tracer of
PBL evolution
0
200
400
600
800
1000
1200
1400
1600
04/06
04/07
04/08
04/09
04/10
04/11
04/12
04/13
04/14
04/15
Day
ß counts

image
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EFTEM micrograph of a carbonaceous UFP