Which mask to be used for a child aged 6 years in this pollution of Delhi (aqi is approx 500)

A. The mask which comes with a filter which has double filter into it that would be a better choice for you to use that’s going to be actually more convenient and comfortable for the child to use so go ahead with that and as of now if I am not mistaken under the age of fifth standard are having schools online so it would be a good option for you to write now use air purifier or humidifier into your room that much better for a child