采用多通道采样器和气溶胶化学组成在线监测仪，对2016年10月北京市区大气亚微米颗粒物（PM1）化学组分进行了离线采样和在线监测。结果表明，整个观测期间，北京PM1质量浓度平均为66.04±51.45 μg/m3，重霾期间PM1的质量浓度（103.16~160.23 μg/m3）是清洁天（3.50~3.78 μg/m3）的27.29~45.78倍；北京秋季重霾天和清洁天的化学组分存在显著差异，有机物是PM1的主要化学组分，清洁天贡献高达64.90%；而在重霾天，二次无机组分显著增长，贡献高达69.72%。硫酸盐日变化趋势相对平缓，反映出区域特性；而其他组分（有机物、硝酸盐、铵盐及氯化物）表现出显著的日变化特征。整体而言，大气PM1中各组分受污染源排放、大气化学反应及天气形势的协同影响。
In this paper, the URG's multi-channel sampler and the Aerosol Chemical Speciation Monitor (ACSM) are used for off-line sampling and online monitoring, focusing on the chemical components of atmospheric submicron particles (PM1) in Beijing in October 2016. It is shown that the average concentration of PM1 in Beijing during the whole observation periods is 66.04 ±51.45 μg/m3 and the mass concentration of PM1 in heavy haze (103.16~160.23 μg/m3) is 27.29~45.78 times of that in clean days (3.50~3.78 μg/m3). Significant differences are observed of the chemical components between heavy haze days and clean days in autumn in Beijing. The organic materials are the main chemical components of PM1, contributing up to 64.90% during the clean days. While the secondary inorganic components increase significantly, reaching as high as 69.72% during the heavy haze days. The diurnal variation of sulfate is relatively small, reflecting the regional characteristics; while other components (organic matter, nitrate, ammonium and chloride) see significant diurnal variations. Overally, the composition of PM1 is affected by sources of pollution, atmospheric chemical reactions and the weather conditions.
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