| Value | Category | Cases | Weighted | |
|---|---|---|---|---|
| 1 | Industrial activities | 17 | 19 | 
                                                                 
                                    
                                    0.7%
                                 
                                                             | 
                            
                        
                        
                            
                    
| 2 | Waste burning | 88 | 102 | 
                                                                 
                                    
                                    3.8%
                                 
                                                             | 
                            
                        
                        
                            
                    
| 3 | Transportation | 29 | 39 | 
                                                                 
                                    
                                    1.4%
                                 
                                                             | 
                            
                        
                        
                            
                    
| 4 | Construction | 2 | 3 | 
                                                                 
                                    
                                    0.1%
                                 
                                                             | 
                            
                        
                        
                            
                    
| 5 | Other | 47 | 48 | 
                                                                 
                                    
                                    1.8%
                                 
                                                             | 
                            
                        
                        
                            
                    
| Sysmiss | 2531 | 2504 |