P4b4 h|L@' )@ @@ @@@@  @ |    @      
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 All sites are  $BAV                    
 Edinbzrgh Cjntzj     Low  1.28  /68    
                                        
 Cardiff Centre       Low  1.58 1.35    
                               i        
    o             a                   0 
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   nz nj  s a s         thb   an        
 a@@@ @@@@@@@@@@ @ @@@@@@@ @ @@@@ @@    
 average of u pbrts per billion(ppbQ    
 presj ts an exce dingly sma   r s      
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   Data from Department of Environment  
 N Engaan  C Englan  U  nelart Air Qual