A5049626185- Atmospheric chemistry and aerosols
- Air Quality Monitoring and Forecasting
- Air Quality and Health Impacts
- Atmospheric Ozone and Climate
- Atmospheric and Environmental Gas Dynamics
- COVID-19 impact on air quality
National University of Sciences and Technology
2019
Glyoxal (CHOCHO) and formaldehyde (HCHO) trace gases were successfully retrieved from a multi-axis differential optical absorption spectroscopy (MAX-DOAS) system in Beijing (39.95°N, 116.32°E) Baoding (39.15°N, 115.40°E), China. The measurements of these span the period May 2017 to April 2018. Higher levels observed most likely due increased transport industrial activities compared Baoding. Different time scales analyzed seasonal daily levels. Seasonal variation categorized by wintertime...
Abstract Background The spatiotemporal variation of observed trace gases (NO 2 , SO O 3 ) and particulate matter (PM 2.5 PM 10 were investigated over cities Yangtze River Delta (YRD) region including Nanjing, Hefei, Shanghai Hangzhou. Furthermore, the characteristics different pollution episodes, i.e., haze events (visibility < 7 km, relative humidity 80%, > 40 µg/m complex episodes 35 160 studied YRD region. impact China clean air action plan on concentration aerosols is examined....
This study was aimed at presenting a continuous and spatially coherent picture of ammonia (NH 3 ) distribution over the Indo-Gangetic Plain (IGP) by exploiting satellite observations. Atmospheric columns were mapped South Asia using TES observations on board NASA’s Aura satellite. Monthly mean data used to identify emission sources atmospheric across Asian region. Data analysed explore temporal trends, seasonal cycles, hot spots within area. The results show that IGP region has most...
The emergence of the novel corona virus and resulting lockdowns over various parts world have substantially impacted air quality due to reduced anthropogenic activity. objective this study is investigate impact COVID-19 lockdown Spring Festival on four major cities Yangtze River Delta (YRD) region, including Shanghai, Nanjing, Hefei, Hangzhou. In situ measurements were taken for nitrogen dioxide (NO2), particulate matter (PM2.5) ozone (O3). from 1 January 25 April two years prior (2018–19),...
Recently, the occurrence of fog and haze over China has increased. The retrieval trace gases from multi-axis differential optical absorption spectroscopy (MAX-DOAS) is challenging under these conditions. In this study, various reported settings for formaldehyde (HCHO) sulfur dioxide (SO2) are compared to evaluate performance different meteorological conditions (clear day, haze, fog). dataset 1st December 2019 31st March 2020 Nanjing, China, used in study. results indicated that HCHO, optimal...
Shanghai has gained much attention in terms of air quality research owing to its importance economic capital and huge population. This study utilizes ground-based remote sensing instrument observations, namely by Multiple AXis Differential Optical Absorption Spectroscopy (MAX-DOAS), situ measurements from the national monitoring platform for various atmospheric trace gases including Nitrogen dioxide (NO2), Sulfur (SO2), Ozone (O3), Formaldehyde (HCHO), Particulate Matter (PM; PM10: diameter...