The BBC is sampling pollution levels in Beijing before and during the Olympics. The daily readings measure air particles known as PM10. The error margin is 20%.
26 August PM10 reading: 93 micrograms per cubic metre. (The World Health Organisation guideline maximum is 50 micrograms per cubic metre, averaged over 24 hours.)
25 August PM10 reading: 70 micrograms per cubic metre. We test for 10 minutes at midday from a seventh floor balcony in central Beijing.
24 August PM10 reading: 99 micrograms per cubic metre.
23 August PM10 reading: 12 micrograms per cubic metre.
22 August PM10 reading: 21 micrograms per cubic metre.
21 August PM10 reading: 56 micrograms per cubic metre.
20 August PM10 reading: 87 micrograms per cubic metre.
19 August PM10 reading: 39 micrograms per cubic metre.
18 August PM10 reading: 18 micrograms per cubic metre. Blue skies over Beijing after a hazy Sunday.
17 August PM10 reading: 54 micrograms per cubic metre.
16 August PM10 reading: 7 micrograms per cubic metre. (The World Health Organisation guideline maximum is 50 micrograms per cubic metre, averaged over 24 hours.)
15 August PM10 reading: 12 micrograms per cubic metre.
14 August PM10 reading: 46 micrograms per cubic metre.
13 August PM10 reading: 128 micrograms per cubic metre.
12 August PM10 reading: 41 micrograms per cubic metre.
11 August PM10 reading: 54 micrograms per cubic metre.
10 August PM10 reading: 278 micrograms per cubic metre.
9 August PM10 reading: 110 micrograms per cubic metre.
8 August PM10 reading: 156 micrograms per cubic metre.
7 August PM10 reading: 191 micrograms per cubic metre.
6 August PM10 reading: 186 micrograms per cubic metre.
5 August PM10 reading: 104 micrograms per cubic metre.
4 August PM10 reading: 292 micrograms per cubic metre.
3 August PM10 reading: 79 micrograms per cubic metre.
2 August PM10 reading: 15 micrograms per cubic metre.
1 August PM10 reading: 19 micrograms per cubic metre.
31 July PM10 reading: 56 micrograms per cubic metre.
30 July PM10 reading: 78 micrograms per cubic metre.
29 July PM10 reading: 8 micrograms per cubic metre.
28 July PM10 reading: 134 micrograms per cubic metre.
27 July PM10 reading: 269 micrograms per cubic metre.
26 July PM10 reading: 165 micrograms per cubic metre.
25 July PM10 reading: 261 micrograms per cubic metre.
24 July PM10 reading: 254 micrograms per cubic metre.
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