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SOx, NOx and rocks Ecological Criteria ISA now public

The first external review draft of the United States Environmental Protection Agency (US EPA) Integrated Science Assessment for Oxides of Nitrogen, Oxides of Sulfur and Particulate Matter – Ecological Criteria is now public.

This integrated science assessment provides a comprehensive evaluation and synthesis of the most policy-relevant science aimed at characterising the ecological effects caused by these criteria pollutants. These criteria pollutants are reviewed here together because they all contribute to nitrogen (N) and sulfur (S) deposition, which causes substantial ecological effects.

Thus, this integrated science assessment serves as the scientific foundation for the review of the ecological effects associated with the secondary (welfare-based, US) national ambient air quality standards for oxides of nitrogen, oxides of sulfur, and particulate matter. The health effects of these criteria pollutants are considered in separate assessments as part of the review of the primary (health-based) national ambient air quality standards for oxides of nitrogen (US EPA, 2016b) oxides of sulfur (US EPA, 2016a), and particulate matter (US EPA, 2009a).

It includes scientific research from atmospheric sciences, exposure and deposition, biogeochemistry, hydrology, soil science, marine science, plant physiology, animal physiology, and ecology conducted at multiple scales (e.g., population, community, ecosystem, landscape levels).