Article
Environmental Sciences
Zeeshan Javed, Aimon Tanvir, Muhammad Bilal, Wenjing Su, Congzi Xia, Abdul Rehman, Yuanyuan Zhang, Osama Sandhu, Chengzhi Xing, Xiangguang Ji, Mingjie Xie, Cheng Liu, Yuhang Wang
Summary: The study compared different retrieval settings for formaldehyde and sulfur dioxide under various weather conditions, finding that specific wavelength windows and polynomial orders led to significantly reduced fitting errors and improved accuracy of vertical column densities. Additionally, the observed vertical column densities of HCHO and SO2 were significantly lower on foggy days compared to clear days, indicating reduced chemical production of HCHO and aqueous phase oxidation of SO2 in fog droplets.
Article
Environmental Sciences
Aimon Tanvir, Zeeshan Javed, Zhu Jian, Sanbao Zhang, Muhammad Bilal, Ruibin Xue, Shanshan Wang, Zhou Bin
Summary: The study reveals a significant impact of reduced anthropogenic activity on air quality in the mega city of Shanghai, China, particularly during the Spring Festival holidays and the COVID-19 lockdown in 2020. The concentration of pollutants in the atmosphere decreased significantly during these periods.
Article
Environmental Sciences
Jiexiao Xue, Ting Zhao, Yifu Luo, Congke Miao, Pinjie Su, Feng Liu, Guohui Zhang, Sida Qin, Youtao Song, Naishun Bu, Chengzhi Xing
Summary: The study measured tropospheric formaldehyde (HCHO) concentrations in Shenyang, China using MAX-DOAS, and discussed the sources of HCHO and its sensitivity to O-3 production.
ENVIRONMENT INTERNATIONAL
(2022)
Article
Environmental Sciences
Yanyu Kang, Guiqian Tang, Qihua Li, Baoxian Liu, Dan Yao, Yiming Wang, Yinghong Wang, Yuesi Wang, Wenqing Liu
Summary: In this study, tropospheric observations of NO2, HCHO, and CHOCHO in Beijing were obtained using multiaxis differential optical absorption spectroscopy. The representativeness of HCHO column densities on TVOC reactivity was evaluated. A new indicator, HCHO + 6 x CHOCHO, was introduced to improve the sensitivity of NOx and reclassify the ozone formation sensitivity of urban areas in North China. The results provide robust support for ozone pollution prevention and control.
Article
Environmental Sciences
Qianqian Hong, Linbin Zhu, Chengzhi Xing, Qihou Hu, Hua Lin, Chengxin Zhang, Chunhui Zhao, Ting Liu, Wenjing Su, Cheng Liu
Summary: In Guangzhou, China, it was found that vertical profiles of formaldehyde and aerosol are more sensitive to O3 pollution in the late afternoon and at noon at higher altitudes, while the vertical profile of nitrogen dioxide exhibits an exponential decreasing shape, indicating lower sensitivity to O3 pollution.
SCIENCE OF THE TOTAL ENVIRONMENT
(2022)
Article
Chemistry, Analytical
Shuyin Liu, Siyang Cheng, Jianzhong Ma, Xiaobin Xu, Jinguang Lv, Junli Jin, Junrang Guo, Dajiang Yu, Xin Dai
Summary: The vertical profiles of nitrogen dioxide (NO2) and formaldehyde (HCHO) in the troposphere at the Longfengshan regional atmospheric background station were analyzed. NO2 concentrations were highest near the surface in the morning and evening, while HCHO had an elevated layer around 1.4 km consistently. NO2 concentrations were higher in cold months and lower in warm months, while HCHO showed the opposite pattern. Ozone production at the station was mainly in the NOx-limited regime. This study provides valuable insights into background atmospheric chemistry and regional ozone pollution processes.
Article
Environmental Sciences
Siyang Cheng, Junli Jin, Jianzhong Ma, Jinguang Lv, Shuyin Liu, Xiaobin Xu
Summary: This study conducted a comprehensive and intensive field experiment to investigate the vertical distribution characteristics of NO2 and HCHO and their relationship with meteorological conditions. The findings reveal important insights into the formation mechanism of ozone pollution and strategies for its control.
Article
Environmental Sciences
Danran Li, Shanshan Wang, Ruibin Xue, Jian Zhu, Sanbao Zhang, Zhibin Sun, Bin Zhou
Summary: This study utilized satellite remote sensing data to analyze the temporal and spatial distribution of formaldehyde (HCHO) in Shanghai from 2010 to 2019, revealing the variation of HCHO in different seasons and regions. It identified temperature, biogenic and anthropogenic emissions as the main factors influencing HCHO levels. The study also found significant seasonal characteristics of O-3 formation regime in Shanghai, with higher O-3 concentration and FNRSAT values in suburban areas.
ATMOSPHERIC CHEMISTRY AND PHYSICS
(2021)
Article
Environmental Sciences
Xiaomei Li, Pinhua Xie, Ang Li, Jin Xu, Zhaokun Hu, Hongmei Ren, Hongyan Zhong, Bo Ren, Xin Tian, Yeyuan Huang, Wenxuan Chai, Shuai Wang, Qingbo Li
Summary: This paper studied the spatial-temporal distribution and transportation of aerosol and several trace gases based on MAX-DOAS observations in three cities in China. It found correlations and seasonal patterns, with comparisons to model results.
Article
Spectroscopy
Liu Guo-hua, Li Qi-hua, Ou Jin-ping, Xu Heng, Zhu Peng-cheng, Liu Hao-ran
Summary: The study on the variation of formaldehyde concentration in Chongqing using the ground-based MAX-DOAS monitoring system shows significant daily and weekly average changes, with higher concentrations in the morning and evening and lower concentrations at noon. The results provide an effective means for real-time monitoring of urban regional pollution gases like HCHO and verifying satellite data sources.
SPECTROSCOPY AND SPECTRAL ANALYSIS
(2022)
Article
Environmental Sciences
Aimon Tanvir, Muhammad Bilal, Sanbao Zhang, Osama Sandhu, Ruibin Xue, Md Arfan Ali, Jian Zhu, Zhongfeng Qiu, Shanshan Wang, Bin Zhou
Summary: Shanghai's air quality during June 2020 to May 2021 was investigated using ground-based remote sensing observations and in situ measurements. The study found distinct diurnal and seasonal patterns in pollutants such as HCHO, NO2, and SO2, with maximum concentrations occurring in winter for NO2 and SO2 and in summer for HCHO. The results also suggested the anthropogenic origin of NO2 and SO2, while HCHO showed substantial contributions from biogenic emissions. Furthermore, the sensitivity analysis revealed that O3 formation in Shanghai is predominantly limited by VOCs, except for summer. The study emphasized the complex interdependence among different pollutants in different seasons and the significant contribution of local sources to Shanghai's air quality.
Article
Environmental Sciences
Fusheng Mou, Jing Luo, Qijin Zhang, Chuang Zhou, Song Wang, Fan Ye, Suwen Li, Youwen Sun
Summary: With the spread of COVID-19 and the implementation of closure measures in 2020, population mobility and human activities have decreased, leading to a serious impact on atmospheric quality. This study investigates the impact of anthropogenic activities on air quality in Huaibei City by comparing the COVID-19 lockdown period in 2020 with the normal situation in 2021.
Article
Environmental Sciences
Feng Liu, Chengzhi Xing, Pinjie Su, Yifu Luo, Ting Zhao, Jiexiao Xue, Guohui Zhang, Sida Qin, Youtao Song, Naishun Bu
Summary: In northeastern China, the seasonal variations in NO2 VCDs are evident with higher values in the winter due to increased emissions and longer atmospheric transport. The diurnal variation of NO2 VCDs shows increases at 11:00 and decreases at 13:00, with the most obvious changes occurring in the winter and autumn. The contributions of local emissions and regional transport to NO2 VCDs vary in different seasons.
ENVIRONMENTAL POLLUTION
(2022)
Article
Environmental Sciences
Hongmei Ren, Ang Li, Pinhua Xie, Zhaokun Hu, Jin Xu, Yeyuan Huang, Xiaomei Li, Hongyan Zhong, Hairong Zhang, Xin Tian, Bo Ren, Shuai Wang, Wenxuan Chai, Chuanyao Du
Summary: This study focused on the pollution characteristics of typical haze and dust events, analyzing the distribution of aerosol extinction and H2O concentrations, as well as the gas vertical column density and vertical distribution characteristics of gases during pollution periods. The results showed significant differences in meteorological conditions during haze and dust pollution, and the study provided insights into the pollution process of tropospheric trace gases in Beijing.
Article
Environmental Sciences
Wei Xue, Jonghan Ko, Ruyin Cao, Zhiguo Yu
Summary: This study proposes a simple yet effective Light and Temperature-Driven Growth model and Double Logistic function fusion algorithm (LTDG_DL) to predict the Landsat 5/7 EVI time series over cloud-prone, fragmented, and mosaic agricultural landscapes. The LTDG_DL algorithm calibrates the empirical EVI by adjusting crop growth using cloud-free Landsat EVI observations and assimilates ground daily solar radiation and air temperature to generate seasonal profiles of the empirical LAI and EVI. Compared to other interpolation functions and fusion algorithms, LTDG_DL algorithm demonstrates superior performance in predicting EVI increment slope, timing of peak EVI, and protecting key Landsat EVI observations.
Article
Environmental Sciences
Fatimah Mahmood, Muhammad Fahim Khokhar, Zafar Mahmood
Summary: This study aims to quantify the impact of climate change on crop productivity in South Asia, particularly on wheat, rice, and cotton. The results show a significant increasing trend in temperature and high inter-annual variability in precipitation. When temperature exceeds specific threshold values, it significantly reduces crop productivity. Furthermore, the region is rapidly heading towards exceeding temperature and threshold values at an alarming rate.
ENVIRONMENTAL SCIENCE AND POLLUTION RESEARCH
(2021)
Article
Energy & Fuels
Shoaib Raza Khan, Muhammad Zeeshan, Muhammad Faheem Khokhar, Zeshan, Iftikhar Ahmad
Summary: This study investigates the co-pyrolysis of rice straw and waste tire, and shows that the feedstock ratio has a significant impact on the products.
BIOMASS CONVERSION AND BIOREFINERY
(2023)
Article
Water Resources
Muhammad Waseem, Tahira Khursheed, Adnan Abbas, Ijaz Ahmad, Zeeshan Javed
Summary: The study quantitatively analyzed the impact of meteorological drought on maize crop production in Punjab, Pakistan, highlighting the sensitivity of yields in the southern region and the significant effect of short-term drought during critical growth periods. Around 27% of yield variations were attributed to meteorological drought, with districts showing increasing sensitivity over time. Recommendations for adopting management strategies and mitigation measures were made based on the spatial and temporal patterns of drought effects on maize production.
JOURNAL OF WATER AND CLIMATE CHANGE
(2022)
Article
Environmental Sciences
Zeeshan Javed, Aimon Tanvir, Muhammad Bilal, Wenjing Su, Congzi Xia, Abdul Rehman, Yuanyuan Zhang, Osama Sandhu, Chengzhi Xing, Xiangguang Ji, Mingjie Xie, Cheng Liu, Yuhang Wang
Summary: The study compared different retrieval settings for formaldehyde and sulfur dioxide under various weather conditions, finding that specific wavelength windows and polynomial orders led to significantly reduced fitting errors and improved accuracy of vertical column densities. Additionally, the observed vertical column densities of HCHO and SO2 were significantly lower on foggy days compared to clear days, indicating reduced chemical production of HCHO and aqueous phase oxidation of SO2 in fog droplets.
Article
Environmental Sciences
Fasiha Safdar, Muhammad Fahim Khokhar, Fatimah Mahmood, Muhammad Zeeshan Ali Khan, Muhammad Arshad
Summary: This study investigates the observed and future precipitation changes in Pakistan using ground, satellite, and model data. The findings reveal a decreasing trend in winter precipitation and an increase in pre-monsoon precipitation. Future precipitation estimates suggest a rise in precipitation for the northern and western parts of Pakistan, while a decrease is predicted for the plains, which could have negative consequences for agriculture.
ENVIRONMENTAL SCIENCE AND POLLUTION RESEARCH
(2023)
Article
Environmental Sciences
Zeeshan Javed, Muhammad Bilal, Zhongfeng Qiu, Guanlin Li, Osama Sandhu, Khalid Mehmood, Yu Wang, Md. Arfan Ali, Cheng Liu, Yuhang Wang, Ruibin Xue, Daolin Du, Xiaojun Zheng
Summary: This study investigated the spatiotemporal variation of trace gases and particulate matter over cities in the Yangtze River Delta region, as well as the characteristics of different pollution episodes. The impact of the China clean air action plan, trans-boundary pollution, and meteorological conditions were examined. The results showed reductions in primary pollutants concentrations, but the formation of secondary pollutants remains a concern. The study highlights the need for continuous monitoring and city-specific policies to effectively deal with metropolitan pollution.
ENVIRONMENTAL SCIENCES EUROPE
(2022)
Article
Environmental Sciences
M. Fahim Khokhar, M. Shehzaib Anjum, Abdus Salam, Vinayak Sinha, Manish Naja, Kirpa Ram, Hiroshi Tanimoto, James H. Crawford, Mohammed I. Mead
ATMOSPHERIC ENVIRONMENT
(2023)
Article
Forestry
Hiba Ahmed, Hamayoon Jallat, Ejaz Hussain, Najam U. Saqib, Zafeer Saqib, Muhammad Fahim Khokhar, Waseem Razzaq Khan
Summary: The Margalla Hills in Pakistan-Himalayan foothills are at risk of deforestation and forest degradation. However, a quantitative evaluation shows that forest cover has increased from 1988 to 2020, while moderate degradation has also increased. The main drivers identified are timber and fuel wood collection.
Article
Multidisciplinary Sciences
Kamran, Junaid Aziz Khan, Umer Khayyam, Abdul Waheed, Muhammad Fahim Khokhar
Summary: In the past three decades, there have been significant land use and cover changes in Islamabad and Rawalpindi. This study aimed to compare and quantify these changes in relation to population growth and urbanization using satellite imagery and population data. The results showed an increase in built-up areas and a decrease in bare land, while vegetation and surface water bodies also exhibited changes. The study findings highlight the importance of effective planning and management of land use and cover in achieving sustainable development goals.
Article
Multidisciplinary Sciences
Ehsan Inam Ullah, Shakil Ahmad, Muhammad Fahim Khokhar, Muhammad Azmat, Umer Khayyam, Faizan Ur Rehman Qaiser
Summary: This study analyzed the impacts of the Ghazi Barotha Hydropower Plant on the hydrological and ecological conditions of downstream areas in Pakistan. The results showed that the operation of the hydropower plant led to significant reductions in river discharge, groundwater levels, and agriculture area, as well as an increase in bare soil. These effects were caused by inadequate compensatory measures and uncontrolled water resource exploitation.
Article
Environmental Sciences
Marium Fiaz, Iftikhar Ahmed, Sumara Masood Ul Hassan, Adnan Khan Niazi, Muhammad Fahim Khokhar, Muhammad Ansar Zeshan, Muhammad Ansar Farooq, Muhammad Arshad
Summary: Excessive use and release of antibiotics in the developing world have negatively impacted soil processes and crop growth. This study investigated the effects of oxytetracycline and levofloxacin on mung bean plants, showing decreased nitrate reductase activity and increased antioxidant enzyme activity. Lower concentrations of antibiotics increased nitrogen content and overall plant biomass, while higher concentrations decreased plant biomass and nitrogen content. Plants treated with levofloxacin and mixtures exhibited increased glutamine synthetase activity. Low doses of antibiotics had lower toxicity symptoms, but higher doses showed increased oxidative stress. The toxicity trend was levofloxacin > mixture > oxytetracycline.
SCIENCE OF THE TOTAL ENVIRONMENT
(2023)
Article
Environmental Sciences
Waqas Ahmed Khan, Faiza Sharif, Muhammad Fahim Khokhar, Laila Shahzad, Nusrat Ehsan, Muhammad Jahanzaib, Enrico Ferrero, Elvira Kovac-Andric
Summary: This study assesses the impacts on ambient air quality patterns and their correlations in Lahore, Pakistan, during strict, moderate, and post-COVID-19 periods. The results show significantly lower pollutant concentrations during strict lockdown, which increase during the moderate and post-COVID-19 periods. The post-COVID-19 period shows a significant increase in the concentrations of various pollutants.
Article
Engineering, Chemical
Zeeshan Javed, Khalid Mehmood, Cheng Liu, Xiaojun Zheng, Chunsheng Xu, Aimon Tanvir, Muhammad Ajmal Khan, Nadeem Siddique, Daolin Du
Summary: This study presents a bibliometric analysis of research on the sensitivity of ozone (O3) formation from 1965 to 2022, using English language journals from the Web of Science Core Collection. The findings show a continuous increase in the number of publications since 2008, with the highest number in 2021. Most publications are from the USA (42.7%), followed by China (13.5%) and the UK (9.1%). Citation burst analysis and analysis of highly cited research work reveal evolving research tendencies, with the emergence of volatile organic compounds and ozone precursors as key topics.
Review
Biology
Xiaojun Zheng, Zeeshan Javed, Bing Liu, Shan Zhong, Zheng Cheng, Abdul Rehman, Daolin Du, Jian Li
Summary: This comprehensive review addresses the spread and impact of Spartina alterniflora in China's coastal wetlands. It summarizes the mechanisms behind its spread and its ability to adapt to different niches, as well as examines its ecological effects on various aspects of ecosystem function. The presence of Spartina alterniflora has significantly changed the structure and configuration of coastal wetlands in China.
Article
Environmental Sciences
Ahmad Iqbal, Naveed Ahmad, Hassan Mohy Ud Din, Michel Van Roozendael, Muhammad Shehzaib Anjum, Muhammad Zeeshan Ali Khan, Muhammad Fahim Khokhar
Summary: This study compares NO2 retrieval settings using DOAS and validates satellite observations with ground-based measurements. The results show that TROPOMI data is more synonymous to ground-based measurements and seasonal trends of NO2 column densities are observed.
AEROSOL AND AIR QUALITY RESEARCH
(2022)
