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Burning yard waste can be an efficient method for large amounts. However, burning has health and environmental risks. Smoke can aggravate respiratory conditions, expose you to carbon monoxide, and cause irritation. Fire produces greenhouse gases and may start wildfires. Minimize risks by burning clean, dry, natural materials. Stay upwind and monitor the fire closely.

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.

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.

How often you should maintain your yard depends on your climate and what season it is. A general rule of thumb is to maintain a lawn height of three inches.