Wouldn't we be burning that oil anyways? I'm sure it burns less 'clean' in a particulate sense, but orders of magnitude worse?
Seems from the petroleum front it's likely to actually reduce particulate matter over the course of months due to the lack of human industrial activity on the planet.
For particulate emissions I would imagine uncontrolled burning in the atmosphere is orders of magnitude worse than the very carefully controlled combustion in an engine with catalytic converters and particle screens. In the US anyway.
Seems from the petroleum front it's likely to actually reduce particulate matter over the course of months due to the lack of human industrial activity on the planet.