Botany - Which trees produce dangerous gas for humans?

Do Not Eat, Touch, Or Even Inhale the Air Around the Manchineel Tree
Meet America’s deadliest tree. Found in Florida, of course.
www.atlasobscura.com/articles/whatever-you-do-do-not-eat-touch-or-even-inhale-the-air-around-the-manchineel-tree

You can find many examples by going to google.com and typing "poisonous tree".