Mold & Health Environmental Relative Moldiness Index (ERMI) EPA describes ERMI as a research tool developed by agency scientists to estimate mold contamination in buildings. The page is research-focused and explains how scientists can assess the amount and types of mold present indoors. EPA · July 13, 2026 · 1 min read EPA describes ERMI as a research tool developed by agency scientists to estimate mold contamination in buildings. The page is research-focused and explains how scientists can assess the amount and types of mold present indoors. Source: EPA. Topics: perplexitymold-health Sources & Citations EPA ↗