n16 almera dci emission's

Had my almera mot done yesterday it passed but the emission's were high . It's regulary serviced and has just been done a couple week's ago so im puzzled! I checked the print out from last year an has almost doubled in a year not sure where to start looking! Last year's reading was 1.02 and yesterday's was 2.64 ! appriciate any help with this one!
 
You better hold Diana's hand across this minefield but for now do the basics, egr clean and drive like you only have the first 3 gears for a few days with some cleaner in the fuel tank.
 
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