The interaction between black carbon and planetary boundary layer in the Yangtze River Delta from 2015 to 2020: Why O didn't decline so significantly as PM.

Since the Air Pollution Prevention and Control Action Plan (air clean plan) issued in 2013, air quality has been in continuous improvement. The second stage of air clean plan since 2018 was focused on O controlling, but it still didn't decline so significantly as PM. This study conducted a long-term observation on black carbon (BC) and utilized the observational data of other air pollutants (PM, PM, NO, SO, CO and O), the meteorological elements and the vertical sounding data of PBL in Nanjing.

Estimation of radiative forcing and heating rate based on vertical observation of black carbon in Nanjing, China.

Owing to a lack of vertical observations, the impacts of black carbon (BC) on radiative forcing (RF) have typically been analyzed using ground observations and assumed profiles. In this study, a UAV platform was used to measure high-resolution in-situ vertical profiles of BC, fine particles (PM), and relevant meteorological parameters in the boundary layer (BL). Further, a series of calculations using actual vertical profiles of BC were conducted to determine its impact on RF and heating rate (HR).

Meteorological Variables and Synoptic Patterns Associated with Air Pollutions in Eastern China during 2013-2018.

Steady meteorological conditions are important external factors affecting air pollution. In order to analyze how adverse meteorological variables affect air pollution, surface synoptic situation patterns and meteorological conditions during heavy pollution episodes are discussed. The results showed that there were 78 RPHPDs (regional PM pollution days) in Jiangsu, with a decreasing trend year by year.

PM vertical variation during a fog episode in a rural area of the Yangtze River Delta, China.

A dense radiation fog event occurred at the Shouxian site, Anhui Province, China, from the evening of January 2 to noon on January 3, 2017. During this event, vertical profiles of particulate matter (PM) and meteorological parameters within the lower troposphere (0-1000 m) were collected using a tethered balloon. This study assessed the evolution of the PM profile with the planetary boundary layer (PBL) structure and the effects of fog on the PM concentration.

Seasonal variations and size distributions of water-soluble ions in atmospheric aerosols in Beijing, 2012.

The characteristics of water-soluble ions in airborne particulate matter in Beijing were investigated using ion chromatography. The results showed that the total concentrations of ions were 83.7 ± 48.