As with precipitation, our air chemistry monitoring centers on a system that allows us to monitor particles and gases that are important components of acid deposition. We use a protocol similar to that used by the Clean Air Status and Trends Network (CASTNET). We also monitor ammonia concentration as part of the National Atmospheric Deposition Program (NADP), Ammonia Monitoring Network. We host a site for the New York State Department of Conservation for ground-level ozone monitoring, a key component of smog. Our filter pack data and ozone data are from 1988 and our ammonia data are from 2009 to present. For questions or further information, please contact Vicky Kelly at KellyV@caryinstitute.org.