| Regulation on the Control of Air Pollution Arising from Heating 2005             | 
                                                                                                        
             | 
                                                                                                        
             | 
                                                                                                        Turkey             | 
                                                                                                        2006             | 
                  
              
                                                                                                        | Emission standards for industrial stationary sources             | 
                                                                                                        
             | 
                                                                                                        
             | 
                                                                                                        Brazil             | 
                                                                                                        2006             | 
                  
              
                                                                                                        | Emissions Standards from Stationary Sources             | 
                                                                                                        
             | 
                                                                                                        
             | 
                                                                                                        Republic of Korea             | 
                                                                                                        2004             | 
                  
              
                                                                                                        | Emissions standards for nonroad vehicles and generator sets             | 
                                                                                                        
             | 
                                                                                                        
             | 
                                                                                                        India             | 
                                                                                                        2002             | 
                  
              
                                                                                                        | Federal Law on Environmental Protection No. 7-FZ             | 
                                                                                                        
             | 
                                                                                                        
             | 
                                                                                                        Russian Federation             | 
                                                                                                        2001             | 
                  
              
                                                                                                        | Emissions standards for air pollutants from combustion             | 
                                                                                                        
             | 
                                                                                                        
             | 
                                                                                                        Mexico             | 
                                                                                                        1997             | 
                  
              
                                                                                                        | Law No.228 on Protection of the Atmospheric Air (Law on Air Protection)             | 
                                                                                                        
             | 
                                                                                                        
             | 
                                                                                                        Tajikistan             | 
                                                                                                        1996             | 
                  
              
                                                                                                        | National emission guideline for stationary combustion turbines             | 
                                                                                                        
             | 
                                                                                                        
             | 
                                                                                                        Canada             | 
                                                                                                        1992             |