How to test for airborne mold

Mold is something that many homeowners are worried about. Not only is mould unsightly, but it has the potential to harm you and your loved ones. Mold causes a variety of respiratory problems and can aggravate asthma. Unlike surface mould, mould spores floating in the air of your home can be hard to detect. Home improvement stores nationwide sell home testing kits that allow you to test for mould spores in the air.

Remove the lid on the petri dish.

Pour the medium into the dish, replace the lid and allow the medium to harden for 1 hour.

Place the petri dish on a level surface in the centre of the room, remove the lid and allow the dish to sit undisturbed for 1 hour. After the allotted time, place the lid on the dish.

Check the dish after 48 hours for signs of mould growth. If mould is not present, check at 72 hours and then again at 96 hours. If there is still no sign of mould, discard the dish. If mould is found growing in the petri dish, continue to Step 5.

Ship the petri dish to the lab for processing. Follow the directions included with the testing kit on where and how to ship the petri dish.


Some home testing kits require a small fee to have the lab process the mould sample. Read the kit instructions for more information.

Things You'll Need

  • Home mould testing kit
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About the Author

Amanda Flanigan began writing professionally in 2007. Flanigan has written for various publications, including WV Living and American Craft Council, and has published several eBooks on craft and garden-related subjects. Flanigan completed two writing courses at Pierpont Community and Technical College.