Obscuring Mist and similar spells vs Blindsight

[flappeercraft]

Would blindsight work through Obscuring mist and allow you to see everything and through the concealment?

[Zancloufer]

It should let you locate creatures that are inside the spell's area of effect. Blindsight states that it:


Some creatures have blindsight, the extraordinary ability to use a nonvisual sense (or a combination of such senses) to operate effectively without vision. Such sense may include sensitivity to vibrations, acute scent, keen hearing, or echolocation. This ability makes invisibility and concealment (even magical darkness) irrelevant to the creature (though it still can’t see ethereal creatures and must have line of effect to a creature or object to discern that creature or object). This ability operates out to a range specified in the creature description.

The creature usually does not need to make Spot or Listen checks to notice creatures within range of its blindsight ability. Unless noted otherwise, blindsight is continuous, and the creature need do nothing to use it. Some forms of blindsight, however, must be triggered as a free action. If so, this is noted in the creature’s description. If a creature must trigger its blindsight ability, the creature gains the benefits of blindsight only during its turn.

So if it can see creatures that are INVISIBLE and in MAGICAL DARKNESS I'm pretty sure a fog cloud won't stop them. It even stops illusion effects like displacement and blur. Do note that Blindsense doesn't negate concealment granted by cover and it generally can't sense creatures that are behind solid walls and the like.

[Psyren]

Generally yes but you do have to pay attention to the nature of the blindsight. For example, if it's due to extremely sharp hearing/echolocation, then effects like magical silence could potentially interfere. Similarly, if it's due to hypersensitive smell, then it will penetrate regular fog - but probably not something more pungent like smoke or a stinking cloud.