Urban issues and challenges

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Question 48

Figure 5: Air pollution levels (PM2.5 concentration) over 24 hours in São Paulo

Line graph showing PM2.5 concentrations in micrograms per cubic metre over a 24-hour period. PM2.5 levels start at 35 micrograms/m³ at 12 am, drop to a low of 20 micrograms/m³ at 4 am, rise to a morning peak of 70 micrograms/m³ at 8 am, drop slightly to 40 micrograms/m³ at 12 pm, and then rise steadily to a peak of 95 micrograms/m³ at 6 pm, before falling back to 45 micrograms/m³ by 11 pm.

Time of day	PM2.5 concentration (micrograms per m³)
12 am	35
1 am	30
2 am	25
3 am	22
4 am	20
5 am	28
6 am	45
7 am	65
8 am	70
9 am	60
10 am	50
11 am	42
12 pm	40
1 pm	45
2 pm	48
3 pm	55
4 pm	72
5 pm	85
6 pm	95
7 pm	90
8 pm	80
9 pm	65
10 pm	55
11 pm	45

Using Figure 5, at what time of day is the PM2.5 air pollution level the highest?

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Urban issues and challenges Questions

GCSE
Geography
Urban issues and challenges

GCSE
Geography AQA
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