Global soil pollution by toxic metals threatens agriculture and human health

Summary

This global meta-analysis synthesised soil pollution data from 1493 regional studies across 796,084 sampling points to create the first comprehensive global map of toxic metal distribution in agricultural soils. The authors identified a previously unmapped high-risk metal-enriched zone in low-latitude Eurasia and estimated that 14–17% of global cropland and 0.9–1.4 billion people are affected by toxic metal pollution exceeding agricultural and health thresholds. The findings underscore toxic metal contamination as a widespread but previously underrecognised threat to soil health, food safety, and human health worldwide.

UK applicability

The United Kingdom likely experiences lower toxic metal pollution than low-latitude regions, though the study does not provide UK-specific analysis; however, the methodological approach and machine learning framework could be applied to map UK soil metal contamination and inform national soil health and food safety policy.

Key measures

Percentage of cropland affected by toxic metal pollution exceedance; number of people living in regions of heightened public health and ecological risk; spatial distribution of seven toxic metals; machine learning-based threshold mapping

Outcomes reported

The study analysed a global database of soil pollution by seven toxic metals (arsenic, cadmium, cobalt, chromium, copper, nickel, and lead) across 796,084 sampling points to map areas exceeding agricultural and human health thresholds. It identified a previously unrecognised high-risk metal-enriched zone in low-latitude Eurasia and quantified the proportion of global cropland and population affected by toxic metal pollution.

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