The Smokiest Islay Whisky

Phenol content is measured in the malted barley after kilning over peat smoke, in parts per million. Distillation and maturation both strip a large share of those phenols out, so a malt specified at 50 ppm does not produce a 50 ppm whisky. Published malt figures are still the only consistent way to compare distilleries, which is why they are used here.

Perceived smokiness also depends on cask type, age, bottling strength and the cut points a distillery uses. A heavily peated whisky matured in active sherry casks can read as less smoky than a lightly peated one bottled young at cask strength.

Distilleries that do not publish a figure are left out of the table rather than estimated. Bunnahabhain's core range is unpeated; Ardnahoe, Port Ellen and the newly opened Laggan Bay have not published standing malt specifications for their current production.

Bruichladdich's Octomore series is released in numbered editions, each with its own stated phenol specification, and those figures have been published well above 100 ppm — far higher than anything else made on the island. Because every edition differs, there is no single Octomore ppm number; the specification is printed on each release.

Below Octomore, the heavily peated group is tightly bunched: Ardbeg around 55 ppm, Kilchoman's standard malt around 50 ppm, Laphroaig around 40–45 ppm, Port Charlotte around 40 ppm and Lagavulin around 35 ppm. The gaps between them are much smaller than the differences in how each distillery ferments, distils and matures.

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