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Sulfate 'n soot kills dinos!

According to Kevin Pope in _Impact dust not the cause of the
Cretaceous-Tertiary mass extinction_, Geology, Feb 2002, pp99-102, impact
dust is not the cause of the Cretaceous-Tertiary mass extinction.

Can anyone tell me how this works--

Is there lots of acid rain (frog-killing acid rain)?

Do all forests start burning, even wet tropical forests?

What is the length of time sulfate remains aloft compared to dust?

Is this modeled anywhere?

Does rain take it out of the atmosphere?

Would you expect a global signature--is there one?

Does this fit the extinction pattern as-well-as, or better-than, the dust?

John Bois