Filters for children's masks

[westcountrycat]

Hi, i have some PM2.5 filters but they are too big to for my child's mask, i can't source any the right size, i'm assuming i can just cut these ones down a bit ?

What do you use ? I've heard kitchen towel but not sure that's as effective.

Thanks

www.swimcell.com/products/pm-2-5-filters?variant=32137525329986
There are smaller kids size ones on here

Thanks I’ll order some for later but need to work out a solution for tomorrow

Kitchen roll supposed to be suitable. Maybe fold it a few times

and I wouldnt cut the filter as there is a carbon layer so it might make a mess