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It’s unlikely your leaves are a hazard, especially if you get to them while they’re dry. However, a couple of rare risks exist. University studies suggest that decaying leaves can produce organochlorines, toxic pollutants similar to man-made PCBs (polychlorinated biphenyls), so avoid keeping them in an enclosed area.

Also, leaves and compost may cause the growth of fungi that can cause diseases like histoplasmosis and aspergillosis, as well as mold spores that are unhealthy for human lungs. Again, severe issues are rare, but those with compromised immune systems or allergies to mold should wear face masks when directly handling leaves.

The legality of blowing leaves into the street depends on your city or county laws. Many cities have codes that restrict blowing leaves into the street because it can obstruct the view of nearby drivers and make cars dirty, not to mention angering neighbors. Violations can result in a fine or other problems. You can check the codes on your municipal government website to learn more local guidelines, but avoid spraying leaves into streets for now.

If composting feels too complicated, mulching is an effective alternative. While composting focuses on breaking down yard waste to feed the soil, mulching uses that same organic material as a protective top layer. It's a quick way to get value from leaves, grass clippings, and other yard debris without the time or effort composting requires.

We always recommend wearing a protective mask when blowing leaves (as well as goggles if possible). Blowing leaves creates a lot of dust, and in many cases that dust contains a bunch of allergens that can make those sensitive very miserable. Even worse, moldy leaves can contain fungi and bacteria that could make humans as animals very sick. Mask up before starting your leaf project, and if anyone is helping you collect the leaves it’s a good idea if they wear a mask, too.