Publications by authors named "Nini Pang"
To understand characteristics of air pollutants and their associated health risks in recent heating seasons in China, ambient monitoring data of six air pollutants in '2 + 26' cities in Beijing-Tianjin-Hebei and its surrounding areas (known as the BTH2+26 cities) during 2016-2020 heating seasons was analyzed. Results show that daily average concentrations of PM, PM, SO, NO, and CO dropped significantly in BTH2+26 cities from the 2016-2017 heating season to 2019-2020 heating season, while 8h O increased markedly. During 2016-2020 heating seasons, annual average values of total excess risks (ER) were 2.
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- In Beijing, a study examined the effects of the 2013 Clean Air Action on aerosol chemistry during the heating seasons of 2016-2018, revealing significant decreases in harmful air pollutants like PM, SO, and NO.
- The research found that while pollutants decreased overall, the nature of PM pollution shifted from being sulfate-driven to nitrate-driven, with photochemical reactions becoming more influential in forming nitrates during the second heating season.
- It emphasized the need for regional collaboration in pollution control, as increased nitrate levels were linked to air masses from polluted areas in the southwest.
To investigate the cause of fine particulate matter (particles with an aerodynamic diameter less than 2.5 µm, PM) pollution in the heating season in the North China Plain (specifically Beijing, Tianjin, and Langfang), water-soluble ions and carbonaceous components in PM were simultaneously measured by online instruments with 1-hr resolution, from November 15, 2016 to March 15, 2017. The results showed extreme severity of PM pollution on a regional scale.
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- China implemented nationwide lockdowns in early 2020 to control COVID-19, leading to significant reductions in economic activities and primary pollution levels.
- Despite these reductions, eastern China still experienced heavy haze pollution, challenging existing beliefs about the direct connection between human activity and air quality.
- Research shows that the haze during the lockdown was mainly due to increased secondary pollution, caused by reduced NO emissions from transportation, which led to higher ozone levels and contributed to the formation of secondary particulate matter.
To study the characteristics and sources of PM pollution in Taiyuan urban area in winter, PM and its chemical components (water-soluble ions, carbon components, and trace elements) and gaseous pollutants (SO, NO) were monitored by online instruments in January 2017. Combined with meteorological data, the characteristics of PM and its chemical components were analyzed. Also, source apportionment of PM was conducted by using positive matrix factorization (PMF).
View Article and Find Full Text PDFTo study the characteristics and sources of trace metals in PM during wintertime in Beijing, PM samples were collected from December 2014 to January 2015 by a middle volume sampler in the urban area of Beijing for 30 consecutive days. The mass concentration of PM was measured by filter membrane weighting method, and 16 kinds of trace metals were determined by inductively couple plasma-mass spectrometry (ICP-MS). In addition, the pollution characteristics and sources of trace metals were analyzed by enrichment factor (EF) method and factor analysis, respectively.
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