What to do after a volcanic eruption- NZ civil defence gov

Listen to your local radio stations for civil defence advice and follow instructions.
Stay indoors and away from volcanic ashfall areas as much as possible.
When it is safe to go outside, keep your gutters and roof clear of ash as heavy ash deposits can collapse your roof.
If there is a lot of ash in the water supply, do not use your dishwasher or washing machine.
Avoid driving in heavy ashfall as it stirs up ash that can clog engines and cause serious abrasion damage to your vehicle.
Keep animals indoors where possible, wash away ash on their paws or skin to keep them from ingesting the ash, and provide clean drinking water.
Use a mask or a damp cloth and eye protection when cleaning up. Moisten the ash with a sprinkler before cleaning.
Look for and report broken utility lines to appropriate authorities.
If your property is damaged, take notes and photographs for insurance purposes. If you rent your property, contact your landlord and your contents insurance company as soon as possible.

https://www.civildefence.govt.nz/resources/what-to-do-after-a-volcanic-eruption

What to do after a volcanic eruption

Continue to follow official advice from:

your Civil Defence Emergency Management Group
the Department of Conservation (for Tongariro, Ngauruhoe, Ruapehu or Taranaki only)
local authorities, and
emergency services.

If you have evacuated, do not return home until told it is safe to do so.

Help others if you can, especially people who may need extra help.

Keep children indoors and discourage play in ash.

Keep animals indoors until ash is cleaned up or washed away. If pets go outside, brush them before letting them back indoors.

Check on your neighbours and anyone who might need your help.

Do not do anything that puts your safety at risk or causes more damage to your property.
Contact your insurance company as soon as possible.
If you rent your property, contact your landlord and your contents insurance company.
Take photos of any damage. It will help speed up assessments of your claims.

https://getready.govt.nz/en/emergency/volcanic-activity