scholarly journals INVESTIGATION OF THE OZONE POLLUTION LEVEL IN SOME PHOTOCOPY ENTERPRISES AND METHOD OF TREATMENT

2011 ◽  
Vol 14 (4) ◽  
pp. 94-100
Author(s):  
Hien Thi To ◽  
Hanh Thuy Lai
Keyword(s):  
Ozone Concentration ◽  
Ho Chi Minh City ◽  
Pollution Level ◽  
Ozone Pollution ◽  
Ozone Absorption ◽  
Epipremnum Aureum ◽  
High Ozone Concentration

This study measured the ozone pollution level in 4 photocopy shops in Ho Chi Minh City during 2 months, from March to April 2010. The result indicated that ozone concentration increases rapidly when the photocopiers start. The highest concentration of ozone is seemed to be from 11h30 to 16h30 every day. The concentration at the entrance is lower than at the center of the photocopy enterprise. Besides, this study also evaluated the ozone absorption rates of Epipremnum Aureum plant by a hermetic model. The result showed that the absorption rates increase by time, reach to 78.9% after 3 days. Consequently, we can use this plant to reduce the high ozone concentration in the photocopy shops.

scholarly journals Spatial–Temporal Distribution Variation of Ground-Level Ozone in China’s Pearl River Delta Metropolitan Region

2021 ◽  
Vol 18 (3) ◽  
pp. 872
Author(s):  
An Zhang ◽  
Jinhuang Lin ◽  
Wenhui Chen ◽  
Mingshui Lin ◽  
Chengcheng Lei
Keyword(s):  
Ozone Concentration ◽  
Pearl River Delta ◽  
Temporal Distribution ◽  
Ground Level ◽  
Metropolitan Region ◽  
Pearl River ◽  
Ozone Pollution ◽  
Ground Level Ozone ◽  
Ozone Concentrations ◽  
The North

Long-term exposure to ozone pollution will cause severe threats to residents’ physical and mental health. Ground-level ozone is the most severe air pollutant in China’s Pearl River Delta Metropolitan Region (PRD). It is of great significance to accurately reveal the spatial–temporal distribution characteristics of ozone pollution exposure patterns. We used the daily maximum 8-h ozone concentration data from PRD’s 55 air quality monitoring stations in 2015 as input data. We used six models of STK and ordinary kriging (OK) for the simulation of ozone concentration. Then we chose a better ozone pollution prediction model to reveal the ozone exposure characteristics of the PRD in 2015. The results show that the Bilonick model (BM) model had the highest simulation precision for ozone in the six models for spatial–temporal kriging (STK) interpolation, and the STK model’s simulation prediction results are significantly better than the OK model. The annual average ozone concentrations in the PRD during 2015 showed a high spatial variation in the north and east and low in the south and west. Ozone concentrations were relatively high in summer and autumn and low in winter and spring. The center of gravity of ozone concentrations tended to migrate to the north and west before moving to the south and then finally migrating to the east. The ozone’s spatial autocorrelation was significant and showed a significant positive correlation, mainly showing high-high clustering and low-low clustering. The type of clustering undergoes temporal migration and conversion over the four seasons, with spatial autocorrelation during winter the most significant.

scholarly journals Study on mapping ozone pollution and ozone pollution regime in Cantho city then propose solutions to reduce ozone pollution

2018 ◽  
Vol 1 (6) ◽  
pp. 247-257
Author(s):  
Bang Quoc Ho ◽  
Tam Thoai Nguyen ◽  
Khue Hoang Ngoc Vu
Keyword(s):  
Air Pollution ◽  
Ozone Concentration ◽  
Ambient Air ◽  
Air Pollutant ◽  
Pollutant Emissions ◽  
Ozone Pollution ◽  
Sensitive Areas ◽  
Study Results ◽  
Can Tho City ◽  
The City

Can Tho City is one the 5th largest city in Vietnam, with hight rate of economic growth and densely populated with 1,251,809 people, butsling traffic activities with 566,593 motobikes and 15,105 cars and hundreds of factories. The air in Can Tho city is polluted by dust and ozone. However, Can Tho city currently does not have a study on the simulation air pollution spread, therefore we do not have an overview on the status of air pollution in order to do not have solutions to limit the increase of pollution status of the city. The purpose of this study is to collect air pollutant emissions from other study. After that, TAPOM model is used to simulate the effects of ozone on the surrounding areas and study the ozone regime in Cantho city. The study results showed that the highest ozone concentration for an hour everage is 196 μg/m3. Compare with national technical regulation about ambient air QCVN 5:2013/BTNMT, ozone concentration is approximately at the allowable limit. The study of ozone regime had identified that VOC sensitive areas are Ninh Kieu district and a part in the south of Binh Thuy district, and NOx sensitive areas are the rested areas of Cantho city. The main cause contributing to increased VOC emission in the central area of the city is motorcycles, NOx emissions in the remaining areas of Cantho city are from the rice production factories. Proposals to protect the air quality in Cantho city are suggested.

The Application of Rubber in the Quantitative Determination of Ozone

1951 ◽  
Vol 24 (4) ◽  
pp. 750-755 ◽  
Author(s):  
C. E. Bradley ◽  
A. J. Haagen-Smit
Keyword(s):  
Nitrogen Oxides ◽  
Quantitative Determination ◽  
Ozone Concentration ◽  
Gas Mixtures ◽  
Catalytic Action ◽  
Ozone Formation ◽  
Close Approximation ◽  
High Ozone Concentration

Abstract A convenient rubber cracking test for ozone is described. This method serves not only as a rapid, positive means of identifying ozone in complex gas mixtures but also gives close approximation to the quantity present. Application of the method in determining ozone in heavy smog atmosphere is shown. The high ozone concentration in these tests is attributed to ozone formation under the catalytic action of nitrogen oxides and sunlight.

scholarly journals Do latitude and ozone concentration predict Covid-2019 cases in 34 countries?

2020 ◽  
Author(s):  
Mark M. Alipio
Keyword(s):  
Linear Regression ◽  
Ozone Concentration ◽  
Large Scale ◽  
Linear Regression Analysis ◽  
Rank Correlation ◽  
Specific Area ◽  
Multivariate Linear Regression ◽  
Multivariate Linear Regression Analysis ◽  
Open Access Database ◽  
High Ozone Concentration

AbstractIn this paper, I used multivariate linear regression analysis to determine if latitude and ozone concentration predict Covid-2019 cases in 34 countries worldwide. Data pertaining to Covid-2019 cases were extracted from Worldometer. Ozone concentration levels were taken from the open-access database of World Ozone and Ultraviolet Radiation Data Centre (WOUDC). Latitude of specific area where measurement took place was also provided in the database. Preliminary Kendall rank correlation test revealed that Covid-2019 incidence was positively and significantly related to ozone concentration; however, incidence was not significantly related to latitude. Using multivariate linear regression, a statistically significant link between ozone concentration and Covid-2019 incidence in 34 countries was established; however, I found no statistical association between latitude and Covid-2019 incidence refuting previous claims. Prompt health actions should be developed for areas with high ozone concentration in the present and possibly, future outbreaks; however, extensive laboratory analysis should be conducted to further confirm the findings of the study. Nevertheless, the results of this study could serve as a basis for further clinical and large-scale studies.

scholarly journals Improved Ozonation Efficiency for Polymerization Mother Liquid from Polyvinyl Chloride Production Using Tandem Reactors

Molecules ◽  
2019 ◽  
Vol 24 (24) ◽  
pp. 4436 ◽  
Author(s):  
Zhiyong Yang ◽  
Penglei Wang ◽  
Yagang Zhang ◽  
Xingjie Zan ◽  
Wenjuan Zhu ◽  
...  
Keyword(s):  
Reaction Time ◽  
Chemical Oxygen Demand ◽  
Polyvinyl Chloride ◽  
Ozone Concentration ◽  
Degradation Rate ◽  
Oxygen Demand ◽  
Cod Removal ◽  
Utilization Efficiency ◽  
High Ozone Concentration ◽  
In Series

Polymerization mother liquid (PML) is one of the main sources of wastewater in the chlor-alkali industry. The effective degradation of the PML produced in PVC polymerization using three or five ozone reactors in tandem was designed with a focus on improving the ozonation efficiency. The ozonation efficiency of the tandem reactors for the degradation of PML, along with the effect of ozone concentration, the number of reactors utilized in series, and the reaction time on the chemical oxygen demand (COD) removal were investigated in detail. The results showed that the COD removal increased as the ozone concentration was increased from 10.6 to 60 mg·L−1, achieving 66.4% COD removal at ozone concentration of 80.6 mg·L−1. However, when the ozone concentration was increased from 60 mg·L−1 to 80 mg·L−1, the COD removal only increased very little. The COD decreased with increasing ozone concentration. During the initial degradation period, the degradation rate was the highest at both low and high ozone concentrations. The degradation rate decreased with reaction time. The rate at a low ozone concentration decreased more significantly than at high ozone concentration. Although high ozone concentration is desirable for COD removal and degradation rate, the utilization efficiency of ozone decreased with increasing ozone concentration. The ozone utilization efficiency of the five-reactor device was three times higher than that of three tandem reactors, demonstrating that ozonation utilization efficiency can be improved by increasing the number of tandem reactors. Ozonation in tandem reactors is a promising approach for PML treatment.

scholarly journals The Measures of Ozone Pollution: An Analysis of Ozone Concentration Data in USA

2008 ◽  
Vol 2 (1) ◽  
pp. 47-53 ◽  
Author(s):  
Hong J. Kim ◽  
Sabrina J. Lovell ◽  
John O’Farrell ◽  
Yongsung Cho
Keyword(s):  
Ozone Concentration ◽  
Ozone Pollution ◽  
Concentration Data

A case of nighttime high ozone concentration over the greater Athens area

2010 ◽  
Vol 19 (1) ◽  
pp. 35-45 ◽  
Author(s):  
Anastasios Mavrakis ◽  
Helena A. Flocas ◽  
Elias Mavromatidis ◽  
George Kallos ◽  
George Theoharatos ◽  
...  
Keyword(s):  
Ozone Concentration ◽  
High Ozone Concentration ◽  
Athens Area
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