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Number of studies by contaminant type across several regions.
| Contaminant type | Sub-Saharan Africa | South Asia and China | Southeast Asia | Middle East and North Africa | Latin America and the Caribbean | US, Europe, Australia |
|---|---|---|---|---|---|---|
| Microbiological | 11 | 10 | 10 | 8 | 8 | 32 |
| Inorganic chemicals (heavy metals) | 7 | 28 | 2 | 5 | 2 | 9 |
| Organic chemicals | 1 | 4 | 1 | 0 | 1 | 2 |
| Note: Some studies focus on more than one contaminant type. In addition, a few studies without a specific contaminant focus are not included in this count. | ||||||
