1. Council Directive 1999/30/EC of 22 April 1999 relating to limit values for sulphur dioxide, nitrogen dioxide and oxides of nitrogen, particulate matter and lead in ambient air, Off. J. Eur. Commun., 29.6.1999.
2. Proposal for a directive of the European Parliament and of the Council on ambient air quality and cleaner air for Europe, http://europa.eu.int/eur-lex/lex/LexUriServ/site/en/com/2005/com2005_0447en01.pdf.
3. National Ambient Air Quality Standards, http://www.epa.gov/air/criteria.html, 2004.
4. Demonstration of COHPAC II for control of fine particulate emissions and air toxics from coal-fired power plants;Harrison;Fuel Energy Abstr.,1997
5. Effective use of COHPAC technology as an effective multi-pollutant control technology;Miller,2001