| Environmental Engineering | 1997 | Q2 |
| Environmental Engineering | 1998 | Q2 |
| Environmental Engineering | 1999 | Q2 |
| Environmental Engineering | 2000 | Q2 |
| Environmental Engineering | 2001 | Q2 |
| Environmental Engineering | 2002 | Q2 |
| Environmental Engineering | 2003 | Q2 |
| Environmental Engineering | 2004 | Q2 |
| Environmental Engineering | 2005 | Q2 |
| Environmental Engineering | 2006 | Q1 |
| Environmental Engineering | 2007 | Q1 |
| Environmental Engineering | 2008 | Q1 |
| Environmental Engineering | 2009 | Q1 |
| Environmental Engineering | 2010 | Q1 |
| Environmental Engineering | 2011 | Q1 |
| Environmental Engineering | 2012 | Q1 |
| Environmental Engineering | 2013 | Q1 |
| Environmental Engineering | 2014 | Q1 |
| Environmental Engineering | 2015 | Q1 |
| Environmental Engineering | 2016 | Q1 |
| Management, Monitoring, Policy and Law | 1997 | Q1 |
| Management, Monitoring, Policy and Law | 1998 | Q1 |
| Management, Monitoring, Policy and Law | 1999 | Q2 |
| Management, Monitoring, Policy and Law | 2000 | Q2 |
| Management, Monitoring, Policy and Law | 2001 | Q1 |
| Management, Monitoring, Policy and Law | 2002 | Q2 |
| Management, Monitoring, Policy and Law | 2003 | Q1 |
| Management, Monitoring, Policy and Law | 2004 | Q2 |
| Management, Monitoring, Policy and Law | 2005 | Q1 |
| Management, Monitoring, Policy and Law | 2006 | Q1 |
| Management, Monitoring, Policy and Law | 2007 | Q1 |
| Management, Monitoring, Policy and Law | 2008 | Q1 |
| Management, Monitoring, Policy and Law | 2009 | Q1 |
| Management, Monitoring, Policy and Law | 2010 | Q1 |
| Management, Monitoring, Policy and Law | 2011 | Q1 |
| Management, Monitoring, Policy and Law | 2012 | Q1 |
| Management, Monitoring, Policy and Law | 2013 | Q1 |
| Management, Monitoring, Policy and Law | 2014 | Q1 |
| Management, Monitoring, Policy and Law | 2015 | Q1 |
| Management, Monitoring, Policy and Law | 2016 | Q1 |
| Waste Management and Disposal | 1997 | Q2 |
| Waste Management and Disposal | 1998 | Q2 |
| Waste Management and Disposal | 1999 | Q2 |
| Waste Management and Disposal | 2000 | Q2 |
| Waste Management and Disposal | 2001 | Q2 |
| Waste Management and Disposal | 2002 | Q2 |
| Waste Management and Disposal | 2003 | Q1 |
| Waste Management and Disposal | 2004 | Q2 |
| Waste Management and Disposal | 2005 | Q2 |
| Waste Management and Disposal | 2006 | Q1 |
| Waste Management and Disposal | 2007 | Q1 |
| Waste Management and Disposal | 2008 | Q1 |
| Waste Management and Disposal | 2009 | Q1 |
| Waste Management and Disposal | 2010 | Q1 |
| Waste Management and Disposal | 2011 | Q1 |
| Waste Management and Disposal | 2012 | Q1 |
| Waste Management and Disposal | 2013 | Q1 |
| Waste Management and Disposal | 2014 | Q1 |
| Waste Management and Disposal | 2015 | Q1 |
| Waste Management and Disposal | 2016 | Q1 |