Is Winn unaware that lead is harmful to humans too.

They said in the episode that the amount was not enough to be harmful to humans.

It may be something similar to how most steel in the real world is contaminated with radioactive dust from the nuclear bomb tests over the years, but it's at a level not generally harmful to people.

If they really need to explain it away later on they can just say that the lead will settle out of the atmosphere over time or something and not be a long term problem. Or, the lead was a lead isotope or molecule or something that's harmful to Daxamites but not humans.

Yes, again - I believe that the audience was owed an explanation. They could have just had the "shower of lead particles" followed by a later "decontamination spray" from the same box that would then take the lead out of the atmosphere (after the Daxamites have already been killed off, of course).

That would require more effort on the show runners part, I'm afraid. I have been a bit harsh on the show this year after being one of it's more staunch supporters in season one, so I will give them that they are perhaps dumbing things down to keep it more palatable to younger children. They would be WRONG to think that way, but at least it would excuse the apparent laziness (or incompetence) in their story telling.

Being where lead is a heavy metal and causes massive issues for the average human, not by a full-blown massive one shot dose, although that would indeed mess up a person's day, but by long-term exposure bits at a time, this plot point was utterly ridiculous. Not only will it be in the atmosphere, but It will be in the water supply, in the food supply and everywhere else on the planet that isn't air tight.
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Yes, again - I believe that the audience was owed an explanation. They could have just had the "shower of lead particles" followed by a later "decontamination spray" from the same box that would then take the lead out of the atmosphere (after the Daxamites have already been killed off, of course).

Dosage. Daxamites are ultrasensitive. For humans it is not ideal, but the dosage was really small. Or it was an organolead compount (some organometallic compounds are really nasty, e.g., arsines).

Or it could have been something even simpler: a (very) dilute solution of lead nitrate. But even so, I feel that the audience deserved an explanation. Perhaps someone could have said, "Hey, Winn - isn't lead toxic to humans, too?" To which Winn would reply, "Yeah - but the amount of lead in this spray is way too low to have any kind of an effect on humans. But Daxamtes are so sensitive to it that even this tiny bit will kill them!"

Being where lead is a heavy metal and causes massive issues for the average human, not by a full-blown massive one shot dose, although that would indeed mess up a person's day, but by long-term exposure bits at a time, this plot point was utterly ridiculous. Not only will it be in the atmosphere, but It will be in the water supply, in the food supply and everywhere else on the planet that isn't air tight.

Dumbest bunch of geniuses ever on this show. Pretty much a scorched earth contingency.

Dosage. Daxamites are ultrasensitive. For humans it is not ideal, but the dosage was really small. Or it was an organolead compount (some organometallic compounds are really nasty, e.g., arsines).

Agree, a gun would've been much more effective.

"....I don't think little scientific oversight matters that much"

Well. "little", yes - but when you're dealing with something as obvious and well-known as lead poisoning, I'd say you should at least acknowledge it (if you expect the audience to buy into the storyline). At least that's the way I would have written it (but maybe that's just the science teacher in me talking there).

"Yeah, but Winn could have just as easily handed James a gun with lead bullets. At least with bullets you don't have to worry about an ill-timed breeze blowing them back at you, or the people you are trying to protect."

Agreed - I would have had someone mention that people should stay out of the line of fire (unless they were wearing some sort of filter or gas mask). And then someone else could say, "Hey, Winn - why not just use regular lead bullets!"

James undoubtedly had filters in his mask courtesy of Winn, and both he and Cat were out of the "line of fire" of the dust spray.

I'm pretty sure you worry about decontamination after you get rid of the murderous, superpowered alien invaders who are trying to kill you.

Priorities.

Yeah, but Winn could have just as easily handed James a gun with lead bullets. At least with bullets you don't have to worry about an ill-timed breeze blowing them back at you, or the people you are trying to protect.

This being on a show about an alien who looks exactly like a person, and can shoot lasers, fly and is invincible, where solar energy can be made into a "sun bomb", and space portals exist, I don't think little scientific oversight matters that much

James undoubtedly had filters in his mask courtesy of Winn, and both he and Cat were out of the "line of fire" of the dust spray.

I'm pretty sure you worry about decontamination after you get rid of the murderous, superpowered alien invaders who are trying to kill you.

Priorities.