PDF(Pubmed)
Abstract：
A series of wildfires in northern Quebec, early July 2002, and in southern Quebec, late May 2010, resulted in severe air pollution downwind. Downwind exposures were investigated to estimate the impact on outdoor and indoor environments. The plumes derived from the wildfires resulted in an increase of over 10 ppbv ozone (O3) concentrations in both major cities and rural areas, while O3 enhancement was not observed at locations adjacent to wildfire burning areas. Temporal trend in PM2.5 concentration showed a peak of 105.5 μg/m3 on July 7, 2002, while on May 31, 2010 the peak was 151.1 μg/m3 in Boston downwind. PM2.5 speciation showed similar trends between the episodes, along with spikes in the PM2.5/PM10 ratio, and in the concentrations of Black Carbon, ΔC (i.e., UV absorbing compounds minus Black Carbon), Organic Carbon (OC), potassium, and chlorine. OC was the most dominant constituent of the PM2.5 mass in the wildfires. The dominant specific carbon fractions include OC fraction 3, pyrolysis carbon, and EC fraction 1, likely due to pyrolysis of structural components of wood. Indoor PM2.5 peaks at two houses corresponded well with the ambient PM2.5 peak, along with the elemental composition, which could indicate an impact of wildfires on indoor air pollution exposure.
摘要：
魁北克北部发生了一系列野火,2002年7月初，在魁北克南部，2010年5月下旬，导致严重的空气污染下风。研究了顺风暴露，以估计对室外和室内环境的影响。野火产生的羽流导致主要城市和农村地区的臭氧（O3）浓度增加了10ppbv，而在野火燃烧区域附近的位置未观察到O3增强。PM2.5浓度的时间趋势显示，2002年7月7日的峰值为105.5μg/m3，而2010年5月31日，波士顿下风的峰值为151.1μg/m3。PM2.5的形成在两个事件之间显示出相似的趋势，随着PM2.5/PM10比率的峰值，在黑碳的浓度中，ΔC(即，紫外线吸收化合物减去黑碳)，有机碳(OC),钾，和氯。OC是野火中PM2.5质量的最主要成分。主要的特定碳馏分包括OC馏分3，热解碳，和EC馏分1，可能是由于木材结构成分的热解。两栋房屋的室内PM2.5峰值与周围的PM2.5峰值非常吻合，连同元素组成，这可能表明野火对室内空气污染的影响。
