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Database providing integrated searches of EPA and state data for 800,000+ regulated facilities, including inspection, violation, and enforcement for the Clean Water Act, Clean Air Act, and hazardous waste laws; Safe Drinking Water Act data, Toxics Release Inventory data, National Emissions Inventory data, and Water Quality Data.
The National Transportation Library is a repository and open science access portal (ROSAP) curated by the U.S. Department of Transportation. It is a good source for all sorts of transportation-related data and content produced by the federal government.