by the way, I read somewhere that this plant is good for clean indoor air quality, but I also read elsewhere that this plant is poisonous and might be harmful for children.

My son has nose allergy (something like sinus), is it safe to put this plant on my kids' study tables?

The only danger of poisoning would be if your child ate it. If he is old enough to know not to eat it then you should be fine.

Can you get Dyna Gro fertilizer there? I think it is a good brand that works well in water. Pothos will live a long time in water without any fertilizer though.