What are the waterproof and dustproof levels of the Xiaomi Pad 5 and Xiaomi Pad 6?

The Xiaomi Pad 6 supports IP53. The Xiaomi Pad 5 is not waterproof or dustproof.
IP53 is an Ingress Protection (IP) rating that classifies and rates the degree of protection provided against the intrusion of solid objects (including dust) and water. IP53 Protected from limited dust ingress. Protected from water spray less than 60 degrees from vertical.