H3K18ac, H3K9me2 and H3K36me3 were associated with arsenic exposed levels.
H3K18ac and H3K36me3 were correlated with oxidative damage induced by arsenic.
H3K18ac and H3K36me3 might involve in transcriptional regulation of OSR genes.
Dysregulation of H3K18ac and H3K36me3 might be biomarkers of arsenic toxicity.