Did dust from the Chicxulub asteroid impact kill the dinosaurs?

Dust might have been responsible for the deadly dinosaur-killing global winter that came after an asteroid slammed into Earth 66 million years ago. Climate simulations suggest that the impact kicked up enough fine particles to block out the Sun and prevent plants from photosynthesising for up to two years. The dust might have stayed in the atmosphere for some 15 years, which resulted in global temperatures dropping by as much as 15 ℃.