TagEPA(118)

In this 2007 U.S. Supreme Court case, Massachusetts and other states sued the Environmental Protection Agency (EPA) for refusing to regulate greenhouse gas emissions from motor vehicles under the Clean Air Act. The Court ruled that the EPA had the authority and responsibility to regulate such emissions, and that states like Massachusetts had legal standing to challenge the EPA's inaction due to real harms caused by rising sea levels and climate change. This case established that carbon dioxide and other greenhouse gases can be regulated as air pollutants under federal law.

This University of Washington newsletter documents over 50 years of air quality research by the Department of Environmental and Occupational Health Sciences, tracing collaborations with Seattle and regional agencies dating back to 1951. It highlights key studies on particulate air pollution from sources such as car exhaust and burning vegetation in the Pacific Northwest, and describes the work of the EPA-funded Northwest Center for Particulate Air Pollution and Health (PM Center), which operated from 1999 to 2006.

USGS report (Exhibit AR034767) on pesticides detected in urban stream water during rainstorms in King County, Washington, in collaboration with Washington State Department of Ecology and King County. Twenty-three of 98 pesticides sampled were detected across 12 study sites in 10 urban watersheds; concentrations of five insecticides (carbaryl, chlorpyrifos, Diazinon, gamma-HCH/Lindane, Malathion) exceeded NAS/NAE recommended

Letter and memorandum from EPA Assistant Administrator Robert Perciasepe transmitting the final Interim Permitting Approach for Water Quality-Based Effluent Limitations in Storm Water Permits to State Water Program Directors and EPA Water Management Division Directors. The policy addresses NPDES storm water permit effluent limitations, adopting best management practices (BMPs) in lieu of numeric water quality-based

This 2001 Memorandum of Agreement between the U.S. Army and the EPA outlines the policies and procedures for determining what types of mitigation are required when issuing permits for discharging dredged or fill material into waters under Clean Water Act Section 404. It establishes a three-step mitigation sequence — first avoiding impacts, then minimizing unavoidable impacts, and finally providing compensatory mitigation for any remaining harm — with a goal of no overall net loss of wetlands. The document provides guidance to Army Corps of Engineers and EPA field personnel on how to evaluate standard permit applications in compliance with these environmental protection standards.

This technical document describes the background water chemistry and modeling assumptions used to estimate how metals move through soil and groundwater at contaminated sites. It outlines key simplifications in the MINTEQ geochemical model, including the assumption of chemical equilibrium and the exclusion of redox potential, and presents soil-sorption values (Kd) for various metals such as arsenic, chromium, and cadmium that vary with soil pH. The results show that metal mobility is most strongly influenced by pH levels in the subsurface environment.

This document debunks common myths about airport air pollution, noise, and emissions regulation, explaining that invisible pollutants can still reach dangerous levels, that fine particles from jet engines bypass the body's natural defenses, and that shoreline communities like those near Sea-Tac may face higher pollution concentrations due to wind patterns. It also reveals that neither the EPA nor FAA effectively regulates aircraft emissions or noise in ways that truly protect nearby residents, as regulatory authority rests with bodies like ICAO that are dominated by airline and airport interests. Additionally, the document highlights that official pollution modeling tools may significantly underestimate actual pollution levels, and that so-called 'noise abatement' programs often fail to reduce noise at all.

EPA Integrated Risk Information System (IRIS) QuickView pages for Antimony (CASRN 7440-36-0) and Arsenic, inorganic (CASRN 7440-38-2), accessed February 14, 2002. Antimony oral RfD is 4×10-4 mg/kg-day based on LOAEL of 0.35 mg/kg-day from Schroeder et al. 1970 rat chronic oral bioassay; confidence rated Low. Arsenic oral RfD is 3×10-4 mg/kg-day based on NOAEL of