Journal of Air Pollution and Health最新文献_第2页

Assessment of the causal relationship between air quality of Delhi and neighbouring cities using Granger causality network 利用格兰杰因果关系网络评估德里与周边城市空气质量之间的因果关系

Journal of Air Pollution and Health Pub Date : 2023-12-28 DOI: 10.18502/japh.v8i4.14540

Sachin Budakoti

{"title":"Assessment of the causal relationship between air quality of Delhi and neighbouring cities using Granger causality network","authors":"Sachin Budakoti","doi":"10.18502/japh.v8i4.14540","DOIUrl":"https://doi.org/10.18502/japh.v8i4.14540","url":null,"abstract":"Introduction: The present work addresses the temporal characteristics of air pollution in Delhi and the surrounding five cities during the years 2019 and 2020. Further, we have addressed the hypothesis whether air pollution of a particular city is affected by its neighboring cities. Materials and methods: To test the hyopthesis we have used the Granger causality test to detect the causal relationship (feedback) between the air pollution of Delhi and its neighbouring cities. Initially we have checked whether the Air Quality Index (AQI) time series are stationary and integrated of the same order. This involved employing a unit root test, specifically Augmented Dickey Fuller (ADF) test followed by Granger causality test. Results: From the descriptive statistical analysis, it is observed that there is a significant reduction in the air pollution across six cities during the year 2020. From causality network, it is observed that bidirectional and unidirectional causal links exists for 2019 and only unidirectional causal links exists for 2020. Air pollution of Delhi is strongly influencing the air pollution of Gurugram city in the year 2019 evident from the higher values of Indegree (0.7) for Gurugram city and high value of outdegree (0.85) for Delhi city. Unidirectional causal links observed from Gurugram city in 2020, whereas unidirectional causal links observed from Delhi, Gurugam and Lucknow cities in 2019. Network in 2020, consists of lesser number of causal links (5), in comparison to the network in 2019, that comprises of more number of causal links (12) that indicates the impact of lockdown on air quality due to COVID-19. Conclusion: Air pollution of highly polluted cities affects the cities with low air pollution. Present work helps the policymakers to implement the effective mitigation and measures to control the air pollution at regional scale.","PeriodicalId":33115,"journal":{"name":"Journal of Air Pollution and Health","volume":"360 17","pages":""},"PeriodicalIF":0.0,"publicationDate":"2023-12-28","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"139149137","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Effectiveness of chemical road dust suppressants on paved roads of Pimpri Chinchwad 化学道路抑尘剂对 Pimpri Chinchwad 铺设道路的效果

Journal of Air Pollution and Health Pub Date : 2023-12-28 DOI: 10.18502/japh.v8i4.14542

Sahila Shaikh, Sachin Mane, Ashok More

{"title":"Effectiveness of chemical road dust suppressants on paved roads of Pimpri Chinchwad","authors":"Sahila Shaikh, Sachin Mane, Ashok More","doi":"10.18502/japh.v8i4.14542","DOIUrl":"https://doi.org/10.18502/japh.v8i4.14542","url":null,"abstract":"Introduction: Currently, reducing road dust emissions is a serious problem for safe and environment-protective transportation, leading to Particulate Matter (PM) limit violations and high population exposures to dust containing poisonous metals and mineral particles. Nowadays chemical road dust suppressants are being employed more frequently as a viable remedy to reduce roadside dust emissions. Materials and methods: Two seasons winter and summer were selected for the study and during which, typically 3 types of roads as per average traffic density and land-use category identified in the city of Pimpri-Chinchwad were sprayed. Dry samples were taken on day one from a 1 m2 area using a portable vacuum cleaner that was run for 8 to 10 min each. Similarly, samples were collected in the same area after 5-10 min after spraying with Calcium Chloride (CaCl ) and Magnesium Chloride (MgCl ). Also, the second set of 2 samples was collected after 24 h of chemical applied. Results: Maximum reduction in silt loading occurred i.e., 99.73% on the application of 30 g/m2 of CaCl . Reduction observed in emission factor of PM2.5 was 97.78% and in the case of PM10 it was 97.59%. While increase in average particle size was observed up to 27.88 µm. Conclusion: Both the suppressant efficient in suppressing the road dust but the day 1 result shows more dust suppression as compared to the day 2 dust suppression also as per the dust loading CaCl2 is a better dust suppressant than MgCl2.","PeriodicalId":33115,"journal":{"name":"Journal of Air Pollution and Health","volume":"59 2","pages":""},"PeriodicalIF":0.0,"publicationDate":"2023-12-28","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"139150485","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Indoor air quality monitoring in metropolitan city Lahore, using handheld devices 使用手持设备监测大都市拉合尔的室内空气质量

Journal of Air Pollution and Health Pub Date : 2023-12-28 DOI: 10.18502/japh.v8i4.14539

Muhammad Muneeb Iqbal, Muhammad Shafiq

{"title":"Indoor air quality monitoring in metropolitan city Lahore, using handheld devices","authors":"Muhammad Muneeb Iqbal, Muhammad Shafiq","doi":"10.18502/japh.v8i4.14539","DOIUrl":"https://doi.org/10.18502/japh.v8i4.14539","url":null,"abstract":"Introduction: Outdoor air pollution has been considered the primary issue by scientists and environmentalists for decades. With the advancement of technology, the activities of human are shifting from outdoor to indoor, urging researchers to investigate the indoor environment. Theerefore, the focus of this study is to examine indoor air quality in the metropolitan of Lahore. Materials and methods: The Temtop M2000C and Temtop H3 Laser monitors were used to collect data on Particulate Matter (PM), Carbon dioxide (CO2) concentration, Total Volatile Organic Compounds (TVOC), and formaldehyde (HCHO). The concentration of air pollutants in nine indoor areas was measured for a specified time interval. The values of particulate matter are measured to find the impact of the outdoor environment on the indoor environment. Results: The maximum average values of the particulate matter PM2.5 and PM10 were 488.6 μg/m3 and 737.2 6 μg/m3, respectively, which reduced drastically after the rain to 219 μg/m3 and 340 μg/m3, respectively. The maximum values of PM2.5 and PM1 0 during coal burning outside the room were 997.6 μg/m3 and 999.9 μg/m3, respectively, far higher than the values during normal conditions. TVOC and HCHO were found within the prescribed limits. Conclusion: The outcomes of this study established a deep impact of the outdoor environment on the indoor environment and recommend air purifiers to reduce the level of pollutants in the indoor environment.","PeriodicalId":33115,"journal":{"name":"Journal of Air Pollution and Health","volume":"87 4","pages":""},"PeriodicalIF":0.0,"publicationDate":"2023-12-28","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"139151821","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Risk analysis of temperature, humidity, ventilation, use of mosquito repellent, and smoking behaviour on the incidence of acute respiratory infections (ARI) in Toddlers 温度、湿度、通风、驱蚊剂的使用和吸烟行为对幼儿急性呼吸道感染（ARI）发病率的风险分析

Journal of Air Pollution and Health Pub Date : 2023-12-28 DOI: 10.18502/japh.v8i4.14543

Putri Ziha Nabiha, R. Azizah, Oryza Filial Zulkarnain, Muhammad Addin Rizaldi, Ayu Kartika Febriani, Wahyu Pudji Nugraheni, Mahmudah Mahmudah

{"title":"Risk analysis of temperature, humidity, ventilation, use of mosquito repellent, and smoking behaviour on the incidence of acute respiratory infections (ARI) in Toddlers","authors":"Putri Ziha Nabiha, R. Azizah, Oryza Filial Zulkarnain, Muhammad Addin Rizaldi, Ayu Kartika Febriani, Wahyu Pudji Nugraheni, Mahmudah Mahmudah","doi":"10.18502/japh.v8i4.14543","DOIUrl":"https://doi.org/10.18502/japh.v8i4.14543","url":null,"abstract":"Acute Respiratory Infections (ARI) are commonly experienced by children, infants, and toddlers. This study analysed the relationship of several factors that cause the occurrence of ARI in Toddlers, namely temperature, humidity, exposure to cigarette smoke, and the use of mosquito repellent. This study used the meta-analysis method by doing a literature search and then finding the value of the effect size using JASP. The research with meta-analysis showed that the smoking behaviour of family members is the highest risk of ARI in toddlers with a value of PR=E1.57=4,572 (95% CI 1.28-1.77). Furthermore, ventilation is the second highest risk of ARI in toddlers, with PR=E1.36=3.896. Then the humidity condition with the value of PR=E1.31=3.706. Other variables, such as air temperature risk increasing the incidence of ARI up to 2,829 times, and mosquito coils that had an impact up to 2,293 times increased the risk of ARI in Toddlers. All variables can increase the risk of ARI in toddlers, with the three most potent variables being smoking behaviour, ventilation, and humidity. Other variables can still increase the risk of ARI in toddlers, but to a lesser extent","PeriodicalId":33115,"journal":{"name":"Journal of Air Pollution and Health","volume":"38 12","pages":""},"PeriodicalIF":0.0,"publicationDate":"2023-12-28","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"139149564","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Experimental investigation on SiO2 nano particle as additives on performance and emission parameters of diesel engine fueled with castor oil blends 二氧化硅纳米颗粒作为添加剂对蓖麻油混合物柴油发动机性能和排放参数的实验研究

Journal of Air Pollution and Health Pub Date : 2023-12-28 DOI: 10.18502/japh.v8i4.14538

Charles Samuel Durai, Narayanan Subramanian, Alwyn Joseph Duraisamy

{"title":"Experimental investigation on SiO2 nano particle as additives on performance and emission parameters of diesel engine fueled with castor oil blends","authors":"Charles Samuel Durai, Narayanan Subramanian, Alwyn Joseph Duraisamy","doi":"10.18502/japh.v8i4.14538","DOIUrl":"https://doi.org/10.18502/japh.v8i4.14538","url":null,"abstract":"Introduction: Today, a lot of research work is carried out in the vegetable oil based fuels which are the blended renewable fuels derived from vegetable oils or the oxygenated fuels which could effect in reduced Carbonaceous emissions. This experimental study investigates the impact of Silicon dioxide (SiO2) nanoparticles as additives on the performance and emission parameters of a diesel engine running on castor oil blends. Materials and methods: Castor oil is a renewable source of biodiesel, but it has limitations such as lower calorific value and higher viscosity compared to conventional diesel. To overcome these limitations, SiO2 nanoparticles were synthesized and characterized. Tests were conducted on a single-cylinder diesel engine under various load conditions using different fuel blends. Results: Results shows that the addition of SiO2 nanoparticles improved the engine's performance by increasing brake thermal efficiency by 25% and reducing specific fuel consumption by 9%. Carbon monoxide emissions (CO) were decreased by 25%, Hydro Carbon emissions (HC) decreased by 52% with SiO2 nanoparticles while a marginal percentage of NOx was also observed. Conclusion: This study demonstrates the potential of SiO2 nanoparticles as additives in enhancing the performance and reducing emissions of diesel engines using castor oil blends, contributing to the development of sustainable transportation.","PeriodicalId":33115,"journal":{"name":"Journal of Air Pollution and Health","volume":"83 5","pages":""},"PeriodicalIF":0.0,"publicationDate":"2023-12-28","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"139151837","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Design and fabrication of a system to capture ambient CO2 设计和制造捕获环境二氧化碳的系统

Journal of Air Pollution and Health Pub Date : 2023-12-27 DOI: 10.18502/japh.v8i4.14535

Sagir Khan, Lokeshwari Navalgund, Keshava Joshi, Abhishek Kumar

{"title":"Design and fabrication of a system to capture ambient CO2","authors":"Sagir Khan, Lokeshwari Navalgund, Keshava Joshi, Abhishek Kumar","doi":"10.18502/japh.v8i4.14535","DOIUrl":"https://doi.org/10.18502/japh.v8i4.14535","url":null,"abstract":"Introduction:In the coming decades, addressing climate change necessitates substantial Carbon dioxide (CO2) emission reductions. Carbon capture and storage are vital for achieving these goals. Beyond industrial emissions, Direct Air Capture (DAC) extracts CO2 from the atmosphere, complementing point source capture and enabling the reduction of atmospheric CO2 concentrations. Our research confirms the thermodynamic feasibility of DAC with Potassium hydroxide (KOH) solution, taking into account energy and performance considerations. Materials and methods: To assess DAC's potential, we built a 1.2 m contactor prototype measuring CO2 absorption from the air. Operating at 100 pa with an air speed of 1.75 m/s in a cross-flow regime, we used KOH and NaOH solutions as capture mediums, implementing duty cycles for absorbent pumping and exhaust fan operation. Results: Our findings revealed that transitioning to intermittent operation can dramatically reduce overall energy costs by 70%. We explored various absorbent concentrations for both KOH and NaOH solutions, examining their impact. Operating temperatures ranged from 14°C to 33°C, providing insights into temperature's pivotal role in DAC performance. Conclusion: This study showcases the viability of DAC with a KOH solution, particularly highlighting the significant energy savings achieved through intermittent operation. These findings emphasise DAC's role as a vital tool in our collective efforts to combat climate change.","PeriodicalId":33115,"journal":{"name":"Journal of Air Pollution and Health","volume":"8 6","pages":""},"PeriodicalIF":0.0,"publicationDate":"2023-12-27","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"139153499","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Monitoring spatiotemporal changes of NO2 using TROPOMI and sentinel-5 images for Dhaka city and its surrounding areas of Bangladesh 利用TROPOMI和sentinel-5影像监测孟加拉国达卡市及其周边地区NO2的时空变化

Journal of Air Pollution and Health Pub Date : 2023-10-08 DOI: 10.18502/japh.v8i3.13785

Nobonita Shobnom, Shahadad Hossain, Rezaul Roni

{"title":"Monitoring spatiotemporal changes of NO2 using TROPOMI and sentinel-5 images for Dhaka city and its surrounding areas of Bangladesh","authors":"Nobonita Shobnom, Shahadad Hossain, Rezaul Roni","doi":"10.18502/japh.v8i3.13785","DOIUrl":"https://doi.org/10.18502/japh.v8i3.13785","url":null,"abstract":"Introduction: Discernable air pollution occurs in most developing countries due to rapid urbanization which can be parameterized by air, humidity, population density, temperature, contaminants, exorbitant fossil fuel consumption, and inadequate transportation. Nitrogen dioxide (NO2), one of the most widely recognized air pollutants, has a detrimental impact on human health explicitly or implicitly and considerably influences on atmospheric composition. Materials and methods: In this study, NO2 intensity was analyzed from 2018 with aiming to monitor spatiotemporal changes in Dhaka and its surrounding areas with the Tropospheric Monitoring Instrument (TROPOMI) sensor data. Copernicus Sentinel-5 Precursor satellite data was used in the Google Earth Engine platform to get the result. Results: The results revealed a strong relationship (R2 =0.9478) between the NO2 concentration and high population density and the temporal variation is higher during the pre-monsoon than throughout the post-monsoon. The reason behind is the lack of sunlight and the difficulty to break down the NO2, which causes the removal of NO2 from the atmosphere to proceed more slowly. In contrast, Land Use and Land Cover (LULC) are also impacted by the high concentration which is remains in the built-up area. Conclusion: This research mainly considered that how NO2 concentration measured from satellite images with temporal variation within a year and what factors strongly influence raising NO2 levels. This model can be used for policy-making to take proper initiatives to reduce NO2 concentrations. The result showed significant uses of TROPOMI with relating population density and LULC in Dhaka and its surrounding areas of Bangladesh.","PeriodicalId":33115,"journal":{"name":"Journal of Air Pollution and Health","volume":"58 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2023-10-08","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"135197532","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Carbon monoxide formation from total volatile organic compounds from the use of household spray products 一氧化碳的总挥发性有机化合物的使用家庭喷雾产品

Journal of Air Pollution and Health Pub Date : 2023-10-08 DOI: 10.18502/japh.v8i3.13790

Jamiu Adetayo Adeniran, Ayodele Sarat Atanda

{"title":"Carbon monoxide formation from total volatile organic compounds from the use of household spray products","authors":"Jamiu Adetayo Adeniran, Ayodele Sarat Atanda","doi":"10.18502/japh.v8i3.13790","DOIUrl":"https://doi.org/10.18502/japh.v8i3.13790","url":null,"abstract":"Introduction: Air pollutants emitted from household spray products used in our homes and offices have adverse effects on human health. The quantification and identification of emission sources of air pollutants forms a foundation for an effective indoor exposure control. This study presents the results of a fundamental study conducted to evaluate the kinetics and emission trends Total Volatile Organic Compounds (TVOCs) and Carbon Monoxide (CO) from household spray products. Materials and methods: Fortyfive (45) commonly used household spray products were selected for this study. The experiment was conducted in an isolated empty room of dimension (2.72×2.82×2.00) m3 with no known/ significant indoor emission source(s). CO and TVOCs concentrations were measured with Aeroqual® 500 series monitor with CO and TVOCs head at 15 min, 1 h, 3 h, and 24 h, for all 45 samples of household spray products. Results: Spontaneous second – order conversion of TVOCs to CO was observed for most of the spray products in the indoor environment. For the insecticides samples, TVOCs initial concentrations were 7.2–73±19.76 ppm which after one hour the concentrations became 1.8 – 17±7.20 ppm. CO measured initial concentration were 0 – 4±1.08 ppm which the concentration levels reduced to 0–7±2.16 ppm. TVOCs concentration was above the permissible limit set by USEPA and CO concentration for some of the air fresheners, perfume, shoe impregnation spray and hair sprays fall short the limit of 40,081.89 and 25,562.37 µg/m3 set by United States Environmental Protection Agency (USEPA) and World Health Organization (WHO), respectively. Conclusion: As the concentration of TVOCs decreased as the concentration the concentration, CO increased following a second order kinetics. The result obtained will help in the development of safer products and a proper guide on how to use them in a way it will not cause harm to both the user of the product and the environment.","PeriodicalId":33115,"journal":{"name":"Journal of Air Pollution and Health","volume":"51 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2023-10-08","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"135198104","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Air quality index prediction using multivariate deep neural networks: A case study of a proposed state capital in India 使用多元深度神经网络预测空气质量指数:以印度拟建的邦首府为例

Journal of Air Pollution and Health Pub Date : 2023-10-08 DOI: 10.18502/japh.v8i3.13784

Venkata Siva Raja Prasad Sunku, Rambabu Mukkamala, Vishnu Namboodiri

{"title":"Air quality index prediction using multivariate deep neural networks: A case study of a proposed state capital in India","authors":"Venkata Siva Raja Prasad Sunku, Rambabu Mukkamala, Vishnu Namboodiri","doi":"10.18502/japh.v8i3.13784","DOIUrl":"https://doi.org/10.18502/japh.v8i3.13784","url":null,"abstract":"Introduction: Air pollution is a major environmental challenge worldwide and predicting air quality is key to regulating air pollution. The extent of air pollution is quantified by the Air Quality Index (AQI). Air quality forecasting has become an important area of research. Deep Neural Networks (DNN) are useful in predicting the AQI instead of traditional methods which involve numerous computations. The aim of this research paper is to investigate the use of the deep neural networks as a framework for predicting the air quality index based on time series data of pollutants. Materials and methods: To resolve this problem, the study proposes a DNN to develop the best model for predicting the AQI. Long Short-Term Memory (LSTM) and Bi-directional LSTM have been introduced in the study to understand and predict the relationship between the pollutants affecting the AQI. The model’s performance is evaluated using the metrics, Mean Absolute Error (MAE), Mean Absolute Percentage Error (MAPE), Mean Square Error (MSE), Root Mean Square Error (RMSE) and coefficient of determination (R2). To conduct the study, real-time hourly data for the period November 2017 to January 2020 from an air quality monitoring station was considered for the proposed capital region of the state of Andhra Pradesh in India. Results: The multivariate modeling considers seven pollutants as independent variables and AQI as the target variable. After experimenting and training the algorithm on the dataset, Bi-directional LSTM was shown to have the lowest MAE and RMSE values and the highest R2, indicating that it has the highest accuracy in AQI prediction. Conclusion: The development of a capital city involves massive construction activity resulting in air pollution. The results are helpful to the authorities to monitor the quality of air of develop air quality management programs thus avoiding the impact of air pollution on health.","PeriodicalId":33115,"journal":{"name":"Journal of Air Pollution and Health","volume":"99 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2023-10-08","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"135197844","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Disentangling the impact of COVID-19 lockdown and meteorological factors on air quality in Colombo, Sri Lanka: A data clustering approach 理清COVID-19封锁和气象因素对斯里兰卡科伦坡空气质量的影响:一种数据聚类方法

Journal of Air Pollution and Health Pub Date : 2023-10-08 DOI: 10.18502/japh.v8i3.13787

Prabhasha Jayasundara, Anushka Elangasinghe, Kim Natasha Dirks

{"title":"Disentangling the impact of COVID-19 lockdown and meteorological factors on air quality in Colombo, Sri Lanka: A data clustering approach","authors":"Prabhasha Jayasundara, Anushka Elangasinghe, Kim Natasha Dirks","doi":"10.18502/japh.v8i3.13787","DOIUrl":"https://doi.org/10.18502/japh.v8i3.13787","url":null,"abstract":"Introduction: Human activities disrupted by COVID-19 have reduced global air pollution. Meteorological day-to-day and year-to-year variability affects pollution levels and complicates estimating reductions. This paper uses data clustering to remove the complexity of non-linear relationships by separating meteorology from complex emission patterns before modelling. The case study is based on PM2.5 concentration time series data and meteorological data for 2018 to 2021 in Colombo, Sri Lanka. Materials and methods: The southwest monsoon brings sea breezes from the Indian Ocean to land from May to October. To separate the effect of the monsoon winds on PM2.5 concentrations, analysis of time series data, polar plots, clusters, and Theil-Sen trends were used based on hourly-average air pollution and meteorological data for the whole dataset. Results: Two clear clusters were identified from scatterplots, representing the monsoon and non-monsoon periods. The study suggests that due to the combined effect of the monsoon winds and a reduction in the levels of traffic as a result of perturbations in human activity, the PM2.5 concentrations decreased at an average rate of 10.61 µg/m3/year (95% CI: 12.86 - 8.11) over the four years. During the non-monsoon season, due to traffic reductions alone, PM2.5 concentrations reduced at an average rate of 7.95 µg/m /year (95% CI: 10.07 – 5.51). Conclusion: These results are relevant to policymakers in the post pandemic planning of traffic and industry, with the methodology readily adapted for use in other locations where a separation of effects may be beneficial.","PeriodicalId":33115,"journal":{"name":"Journal of Air Pollution and Health","volume":"23 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2023-10-08","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"135198105","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0