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Letter to the Editor: Baseline assessment of microplastic contamination in agricultural soils from the coastal stretches of Karnataka and Goa, Southwestern India
Summary
This letter comments on a baseline study of microplastic contamination in Indian coastal agricultural soils, noting the absence of background contamination data makes it difficult to interpret the findings. The authors urge future studies to include soil chemistry context to better assess microplastic pollution levels.
Recently, Mahreen et al. (2025) have carried out a baseline survey of microplastic (MP) contamination in the Indian coastal agricultural soils. They also found MPs on all samples, as well as toxic heavy metals (Fe, Cd, As) that were attached to MP surfaces (Mahreen et al., 2025). The presence of multiple heavy metals on MPs, as indicated by the authors, was interpreted as an indication of a complex scenario of pollution whose consequences might have adverse effects on the health of the soil, crop productivity, and soil biota. This is a valuable addition to the knowledge of MP pollution in the terrestrial environment. Nevertheless, we would like to highlight an important methodological weakness that could influence the interpretation of such findings: the lack of a contextual background, contamination, and soil chemistry. In the absence of this information, one cannot tell whether the identified heavy metals on MPs identify a truly novel risk pathway or merely indicate co-existing pollution that is already in the soil environment.