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Table 2

Fluoride concentrations in sites resampled over time, 2015–2020 Tanna Island, Vanuatu

SiteAreaNSourceYear sampledRange, F (mg/L)
West Tanna Groundwater 2018, 2019, 2020 3.3 
West Tanna Groundwater 2015a, 2018, 2018 3.9–4.0 
West Tanna Groundwater 2018, 2018, 2020 3.8–3.9 
11 West Tanna Groundwater 2019, 2020 4.6 
12 West Tanna Groundwater 2017, 2020 4.20–4.37 
19 Whitesands Rainwater 2018, 2020 0.05–4.0 
31 South West Tanna Spring water 2019, 2020 0.17 
SiteAreaNSourceYear sampledRange, F (mg/L)
West Tanna Groundwater 2018, 2019, 2020 3.3 
West Tanna Groundwater 2015a, 2018, 2018 3.9–4.0 
West Tanna Groundwater 2018, 2018, 2020 3.8–3.9 
11 West Tanna Groundwater 2019, 2020 4.6 
12 West Tanna Groundwater 2017, 2020 4.20–4.37 
19 Whitesands Rainwater 2018, 2020 0.05–4.0 
31 South West Tanna Spring water 2019, 2020 0.17 

aBold data from 2015 are from Stewart et al. (2016).

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