| http://www.unece.org/env/lrtap/protocol/94sulp_a/annex4.htm This page contains a list of major sources of sulfur emissions and possible ways to clean up and reduce emission levels. | |
| http://www.epa.gov/capi/capi.html This is the Clean Air Power Initiative (CAPI) put forth by the EPA to regulate air pollutants from factories, and is a component of the Integrated Planning Model. | |
| http://odin.dep.no/md/html/acid/Policy.htmlThis page is designed by the Norwegian Pollution Control Authority and it covers policies and instrumentation needed to reduce sulfur and nitrogen emissions. |