title: Wildland fire management and air quality in the southern Sierra Nevada: using the Lion Fire as a case study with a multi-year perspective on PM(2.5) impacts and fire policy.
abstract: Management of fire is an important and controversial policy issue. Active fire suppression has led to a backlog of fuels, limited the ecological benefits of fire, and reduced short-term smoke impacts likely delaying these emissions to future generations over a larger spatial extent. Smoke impacts can be expected to increase as fire size and intensity increase and the fuel backlog is consumed; whether through reintroduction of fire under desirable conditions or through stand replacing fire. Land Management Agencies would like to increase the use of naturally ignited fires to burn during favorable conditions as a way to reduce catastrophic fires. This study provides information about the levels of air quality impacts expected from these types of fires and discusses some of the policy controversies of managed fire that propagate inconsistencies between agencies and enter the public discourse. The Lion Fire, a primarily low intensity 8,370 ha fire that was extensively monitored for Particulate Matter less than 2.5 microns (PM2.5), is used to quantify impacts to air quality. PM2.5 monitoring sites are used to assess exposure, public health impacts, and subsequently quantify annual air quality during a year with a fire that is within the historic normal fire size and intensity for this area. Ground level PM2.5 impacts were found to be localized with 99% of the hourly Air Quality Index readings in the moderate or good category for the sites impacted by the fire. PM2.5 concentrations at sites nearest the fire were below annual federal air quality standards for PM2.5 with annual 98th percentile at the most impacted sites (Johnsondale, Kernville, and Camp Nelson) of 35.0, 34.0, and 28.0 μg m(-3) respectively. Smoke impacts to PM2.5 concentrations were not found to reach the populated Central Valley. The findings suggest that this type of fire can be implemented with minimal public health impacts thus allowing an opportunity for air and fire managers to alter policy to allow additional burning in an area with severe anthropogenic air pollution and where frequent widespread fire is both beneficial and inevitable. The more extensive air quality impacts documented with large high intensity fire may be averted by embracing the use of fire to prevent unwanted high intensity burns. A widespread increase in the use of fire for ecological benefit may provide the resiliency needed in Sierra Nevada forests as well as be the most beneficial to public health through the reduction of single dose exposure to smoke and limiting impacts spatially.
authors: School of Social Sciences, Humanities and Arts, University of California, Merced, 5200 N. Lake Road, Merced, CA 95343, USA. Electronic address: dschweizer@ucmerced.edu.
authors: Don
authors: D
authors: Schweizer
authors: School of Social Sciences, Humanities and Arts, University of California, Merced, 5200 N. Lake Road, Merced, CA 95343, USA. Electronic address: rcisneros@ucmerced.edu.
authors: Ricardo
authors: R
authors: Cisneros
mesh_terms: D000393:Air Pollutants / Q000032:analysis*; D002140:California; D003247:Conservation of Natural Resources / Q000379:methods*; D005390:Fires / Q000517:prevention & control; D006801:Humans; D010316:Particle Size; D052638:Particulate Matter / Q000032:analysis*; D011634:Public Health
chemical_list: D000393:Air Pollutants; D052638:Particulate Matter
keywords: Air quality; Policy; Public health; Smoke impacts; Wildland fire