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. And we monitor continuous carbon dioxide with a Licor LI-840 CO2 analyzer. Our filter pack data and ozone data are from 1988 and our ammonia and CO2 data are from 2009 to present. For questions or further information, please contact Vicky Kelly at KellyV@caryinstitute.org.