Implications of leaf burning for adverse respiratory conditions and release of fine particulates and air pollutants

Abstract

The residential burning of leaves, brush, grass, and other forms of vegetation are major and underappreciated source of particulates smaller than 2.5 μm (PM2.5), carbon monoxide, and many other air pollutants including carcinogenic polycyclic hydrocarbons such as benzo(a)pyrene. Residential leaf burning has been linked to significantly poorer urban/suburban air quality, respiratory morbidity and mortality, serious burn injuries to people, and property damage. Other forms of biomass burning such as wildfires, wood burning, peatland wildfires, and the deliberate burning of woodlands and agricultural fields produce large amounts of air pollutants, which are somewhat similar in composition to those released from leaf burning. Leaf burning has been linked to significantly higher rates of asthma and other respiratory problems. Exposure to wildfire smoke has been linked to significantly higher rates of cancer, infections, and a wide range of health conditions including respiratory, cardiovascular, psychiatric, and reproductive problems. Leaf burning and other forms of biomass burning produce significant quantities of dark particulates that accelerate global warming. Leaf burning also presents serious risk of burn injuries to humans, wildlife, and buildings. A number of U.S. states and European Countries have imposed total state or national bans on leaf burning. In fact, many communities offer free or inexpensive community leaf pickup and composting services. Leaf composting offers many advantages over leaf burning; for instance, leaf compost is a valuable product useful for growing plants. In conclusion, homeowners, communities, and nations should compost leaves, brush, and grass clippings rather than burning them.