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Hello, I'm Dr Gary. I've been practicing veterinary medicine since 2007. I look forward to helping with your questions/ concerns.
This is likely just some irritation to the respiratory tract. This should resolve nicely over a day or two.
What I would do to help, is pick up some artificial tear drops. Genteal is a common one used. You can place these in each nostril and each eye every 4-6 hours for 3-5 days. This will help the irritation and allow the signs to resolve faster.
This is nothing toxic, it's just an irritant to cats.
I hope this helps, let me know if you have any other questions.