There was a lot of smoke blowing high over the west coast of the United States last summer due to forest fires. It was thick enough that near the horizon, the Sun was all but invisible. It could probably just barely be discerned if one tried hard enough, but I thought it might be best to avoid staring directly at it, visible or not. Especially as my camera could still see it:
A closeup (in which you can even see what I think is a sunspot!):
Is this infrared light my camera is detecting? Why is it allowed through the smoke relatively unscattered, compared to visible light?
Additionally, could the invisible light be harmful if stared at? (Perhaps there are longer wavelengths than my camera is picking up which are even brighter?)