It’s red cedar, but the humidity is extremely high and it would be outside so I don’t think there will be much dust to cause respiratory issues. It’s not totally cedar but mostly. I need something to soak up the mud in and around the run
If you're not sure as to percentage of cedar to other woods, as a precaution I'd mix it with other wood chips if possible to dilute down the cedar. And of course if you're doing deep litter, the addition of other organic matter should help with that.
Really what you're looking for is to be able to stand in the middle of it and not smell the obvious cedar scent. Mine is so inert that has just a vague general woody type smell, like a stroll down a wooded path.