The Allowances Query Wizard is part of a suite of Clean Air Markets-related tools that are accessible at https://ampd.epa.gov/ampd. The Allowances module allows the user to view...

This dataset compiles surface water chemistry data from 1980 to 2018 and will be updated annually with an approximate lag time of one year. Data are collected in four regions in...

This dataset provides time series of tree ring N isotopes for individual trees and corresponding time series of temperature, precipitation, atmospheric N deposition, atmospheric...