What fruit is banned on public transportation in many countries?

In many Southeast Asian countries, the law prohibits durians on public transportation, and hotel employees vigilantly sniff out guests who sneak the fruit inside. Its noxious odor, reminiscent of a rotting sweet onion, can be detected from across a room. This, of course, is without opening the watermelon-sized fruit. After consumption, the odor lingers on clothing, people, and tastebuds for hours. Even fans of the polarizing fruit are wary of its powerful scent.

Source: Atlas Obscura