Ground-level ozone in urban Beijing over a 1-year period: Temporal variations and relationship to atmospheric oxidation

Influences of Atmospheric Pollution on the Contributions of Major Oxidation Pathways to PM2.5 Nitrate Formation in Beijing

“…Beijing and Tokyo are at similar latitudes in East Asia, so their O 3 concentrations and temporal variations are comparable (Akimoto et al, ; Wang et al, ; Yoshino et al, ). Accordingly, we assumed that the empirical relationship between O 3 and HO 2 concentrations established in Tokyo (Kanaya et al, ) was applicable for estimating the HO 2 concentrations in Beijing.…”

Water-soluble organic carbon (WSOC) and its temperature-resolved carbon fractions in atmospheric aerosols in Beijing

“…Interestingly, the spring also had high WSOC/OC ratios. The relatively strong solar radiation and high concentrations of ozone in spring (Sun et al, 2015;Wang et al, 2015b) were plausible reasons. Other important factors may be the prevalent dust and relatively high wind speed in this season.…”

“…The high WSOC/OC ratio has been used to infer great extent of secondary aerosol formation and/or aging of aerosols during long-range transport (Ram et al, 2012). Therefore, the high WSOC/OC ratios in summer were likely due to active SOA formation associated with higher O 3 , solar radiation, and VOC emissions (Sun et al, 2015;Wang et al, 2015b). In addition, the high acidity in particulate in the summer of Beijing, which can enhance the production of secondary organic aerosols through heterogeneous acid-catalyzed chemistry (Pathak et al, 2011;Rengarajan et al, 2011), may be another reason.…”

Identification of nitrogen dioxide and ozone source regions for an urban area in Korea using back trajectory analysis

“…As such, several source processes were expected to contribute to the pollution of NO x and O 3 (e.g., vehicle exhaust, evaporative emissions, petrochemical emissions, and coating-related emissions) (Choi et al (2011) in the target local environment. Likewise, Wang et al (2015) observed the regional transport of O 3 along the upwind directions in Beijing over a period of one year (December 2012 to November 2013) along with the relationship of its well-known precursors (CO,NO,and NO 2 ). It is interesting to note that from 2009 to 2012, the possibly important role of the oceanic sources was also observed along with local sources (Chen, 2014;Lim et al, 2010;Xu et al, 2008;Zhang et al, 2014).…”