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There are many units of measurement available. The standard unit of measurement for breathalysers is microgrammes of alcohol per 100ml of breath, or µg/100ml.

The English and Welsh drink driving limit is 35µg/100ml.

Other units of measurement include:

  • mg/L
  • %BAC
  • milligrammes of alcohol per 100ml of blood or Permille
  • milligrammes of alcohol per 100ml of urine
µg/100ml mg/L %BAC Permille ‰ Urine
50 0.500 0.12 1.200 152
English/Welsh drink driving limit 35 0.350 0.08 0.800 107
Scottish drink drive limit 22 0.220 0.05 0.500 67
15 0.150 0.04 0.350 46
European commercial drink drive limit 9 0.090 0.02 0.200 28
Zero 0 0 0 0 0
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