Which benchmark in the Green Screen hazard assessment indicates the highest level of concern for chemicals?

Benchmark 1 in the Green Screen hazard assessment represents the highest level of concern for chemicals because it identifies substances that are known to pose significant health and environmental hazards. This benchmark categorizes chemicals that have high toxicity or are considered potential hazards based on extensive scientific research and regulatory data. The emphasis is on minimizing exposure to these substances due to their potential impacts on human health and ecosystems.

In contrast, the other benchmarks represent progressively lower levels of concern. As you move from Benchmark 2 down to Benchmark 4, the substances in these categories may have varying degrees of environmental and health impacts, but they do not carry the same high level of immediate concern as those identified in Benchmark 1. Understanding this distinction is crucial for making informed decisions about material selection and sustainable building practices in alignment with LEED certification goals.