The log jam in the Suez canal last month produced a spike in ship pollution that was visible from space.
When the container vessel Ever Given got itself wedged in the famous waterway, it forced hundreds of other ships wanting passage to park up.
This helped push the concentration of sulphur dioxide (SO2) in the air to five times normal levels on the Mediterranean side of the canal.
SO2 is a by-product of the type of heavy fuel oils burnt by ship engines.
The International Maritime Organization (IMO) is on a drive currently to limit emissions of the gas because of the deleterious effects it can have on the environment and human health.
More than 350 ships got caught up in the Suez blockage, which ran from 23 to 29 March.
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