For me, I think it is the mold that develops a couple of days after they are delivered. The pile gets super hot, and when you dig in lots of gray dust goes up in the air. I got my last wood chips in late August, spread them as fast as I could throughout early Sept, so they were never rained on or anything. If I dig in the garden even now where the chips are, I will cough the next day.Never have used a mask working with wood chips nor have I seen tree service chipper feeder guys where them. Wonder if it was certain types of trees?
Oh well. Hope someone near there was able to score on them.
Fresh or dry wood chips don't bother me.
My last chips came from that same CL ad, btw.
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