Atmospheric Nanoparticles - Environmental and Human Health Impacts of Nanotechnology - page 162

40000 6000

N(11-30 nm)
Light duty traffic
Heavy-duty traffic
Particle surface area

5500

35000

5000

30000 4500

4000

25000

3500

20000 3000

2500

15000

2000

10000 1500

1000

5000

500

Sun Mon Tue Wed Thu Fri Sat

0 0

Figure 5.1 Median integrated particle numbers for particle sizes ranging from 11 to 30 nm
from Scanning Mobility Particle sizer and median weekly cycles for light duty traffi c (cars
and motorcycles) and heavy duty traffi c (lorries, cars, coaches) at Marylebone Road, London.
(Reprinted from A. Charron and R.M. Harrison, Primary particle formation from vehicle emis-
sions during exhaust dilution in the roadside atmosphere, Atmospheric Environment , 37 ,
4109-19. Copyright 2003, with permission from Elsevier.)

90000

80000

Night
Morning rush hour
Midday
Afternoon rush hour

70000

60000

50000

40000

30000

20000

10000

0

1 0 1 0 1 0 0

Dp (nm)

Figure 5.2 Median particle size distributions measured at Marylebone Road, London on
weekdays from 1999-2001. (Reprinted from A. Charron and R.M. Harrison, Primary particle
formation from vehicle emissions during exhaust dilution in the roadside atmosphere,
Atmospheric Environment , 37 , 4109-19. Copyright 2003, with permission from Elsevier.)