Table 1.
11-hr averages (0730-1830 hr) PM2.5 concentrations (μg/m3) at seven sites in Nairobi.
| Location | July 6 | July 7 | July 8 | July 9 | July 10 | July 13 | July 14 | July 15 | July 16 | Mean ± SD |
|---|---|---|---|---|---|---|---|---|---|---|
| Core Sites (RN, TM, and RR are in the central business district; TR is a commuter route; KU is in a rural location) | ||||||||||
|
| ||||||||||
| Ronald Ngala | 73.9 | 64.3 | 74.0 | 94.5 | 93.6 | 59.1 | 61.1 | 92.6 | 67.6 | 75.6±14.4 |
| Tom Mboya | 95.0 | 127.5 | 124.1 | 94.7 | 103.7 | 87.9 | 100.9 | 77.0 | 71.7 | 98.1±18.9 |
| River Road | 83.1 | 138.8 | 115.3 | 84.6 | 66.5 | 67.3 | 77.7 | 95.4 | 70.1 | 88.8±24.3 |
| Thika Rd In | 70.3 | 93.3 | 50.4 | 26.2 | 60.8 | 62.1 | 58.4 | 57.5 | 42.5 | 58.1+18.8 |
| Thika Rd Out | 79.6 | 101.1 | 81.0 | 65.8 | 77.2 | 76.9 | 73.8 | 62.8 | 90.1 | 78.7±11.7 |
| Kenyatta Univ | 7.4 | 13.3 | 12.1 | 6.9 | 5.0 | 16.0 | 13.6 | 11.5 | 10.7±3.8 | |
|
| ||||||||||
| Horizontal Dispersion Site | ||||||||||
|
| ||||||||||
| Upwind 0m | 45.7 | 38.7 | 59.2 | 59.2 | 50.7±10.2 | |||||
| Downwind 0m | 149.3 | 129.4 | 100.3 | 135.8 | 128.7± 20.7 | |||||
| Downwind 30m | 27.1 | 29.4 | 25.0 | 32.2 | 28.4+3.1 | |||||
| Downwind 100m | 19.9 | 21.1 | 14.6 | 19.2 | 18.7+2.8 | |||||
|
| ||||||||||
| Vertical Dispersion Site | ||||||||||
|
| ||||||||||
| Street level | 98.2 | 133.0 | 127.3 | 119.5+18.7 | ||||||
| 1st floor | 67.1 | 80.2 | 81.7 | 76.3+8.0 | ||||||
| 3rd floor | 46.6 | 66.3 | 57.7 | 56.9+9.9 | ||||||
| Rooftop | 33.9 | 46.4 | 48.1 | 42.8+7.8 | ||||||
|
| ||||||||||
| Urban Rooftop Reference Site (24 hour average) | ||||||||||
|
| ||||||||||
| 40.3 | 49.6 | 28.2 | 53.1 | 14.5 | 33.4 | 30.0 | 26.9 | 37.8 | 34.9±11.9 | |
*
Note that the University of Nairobi site was operated as part of a separate ongoing study, and is included here for reference purposes courtesy of Johan Boman, Gothenburg University, Sweden. Concentrations at the University of Nairobi site are 24-hr averages.