| Sampling site | Zone | Geographic coordinates |
| ABLASSE Garage | Tanghin | 12˚23'31.8'' LN 01˚31'43.1'' LW |
| SONABEL Ouaga 1 | Paspanga | 12˚23'02.7'' LN 01˚30'57.0'' LW |
| TAN-ALIZ Factory | Kossodo | 12˚24'55.4'' LN 01˚28'33.4'' LW |
| KOSSODO Abattoir | Kossodo | 12˚25'01.5'' LN 01˚28'31.1'' LW |
| KARIM Garage | Koulouba | 12˚21'58.7'' LN 01˚30'40.2'' LW |