The ship was only in port for six hours, and in the evening Captain Nichols watched the vanishing smoke from her funnels as she ploughed East through the wintry sea.
The device found that the air on the deck downwind of, and directly next to the ship's funnels, had 84,000 ultra-fine particulates per cubic centimetre.
The headlights came on and cut twin funnels of light in the rain.
