We have chemical receptors on our tongue and in our nose for poisons. We have neurons that detect pain. Just because we can sense it doesn't mean it's not harmful.
Ozone doesn't have a smell. What you actually smell is your nose burning. Ozone is a very aggressive oxidizer.
Looking directly at the sun is also a super bad idea.
Wait, what? Do you have a source for this?
This does not sound right. This is what I see on Wikipedia which is also exactly what I was taught in high school:
> It is a pale blue gas with a distinctively pungent smell.
But it is perhaps misleading to concentrate on things that are exclusively blue... The real problem is light containing the relevant range of frequencies, which includes many non-blue colors, due to the relative presence of other frequencies. For example, your eyes would probably absorb much fewer relevant photons when staring at an empty patch of sky than when staring at the sun, even though the sun is not considered blue. And looking at the sun does cause unpleasantness.