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

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 Winter Ozone Pollution in Utah’s Uinta Basin is Attenuating

Atmosphere ◽  
2020 ◽  
Vol 12 (1) ◽  
pp. 4
Author(s):  
Marc L. Mansfield ◽  
Seth N. Lyman
Keyword(s):  
Ground Level ◽  
Ambient Air ◽  
Quality Standard ◽  
Ozone Pollution ◽  
Uinta Basin ◽  
Concentration Data ◽  
Previous Decade ◽  
High Concentrations ◽  
Ambient Air Quality Standard ◽  
Ozone Precursor

High concentrations of ground-level ozone have been observed during wintertime in the Uinta Basin of western Utah, USA, beginning in 2010. We analyze existing ozone and ozone precursor concentration data from 38 sites over 11 winter seasons and conclude that there has been a statistically significant (p < 0.02) decline in ozone concentration over the previous decade. Daily exceedances of the National Ambient Air Quality Standard for ozone (70 ppb) have been trending downward at the rate of nearly four per year. Ozone and NOx concentrations have been trending downward at the rates of about 3 and 0.3 ppb per year, respectively. Concentrations of organics in 2018 were at about 30% of their values in 2012 or 2013. Several markers, annual ozone exceedance counts and median ozone and NOx concentrations, were at their largest values in the period 2010 to 2013 and have never recovered since then. We attribute the decline to (1) weakening global demand for oil and natural gas and (2) more stringent pollution regulations and controls, both of which have occurred over the previous decade. We also see evidence of ozone titration when snow cover is absent.

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.

Occurrence of discontinuities in the ozone concentration data from three reanalyses

2020 ◽  
Author(s):  
Peter Krizan ◽  
Michal Kozubek ◽  
Jan Lastovicka
Keyword(s):  
Time Evolution ◽  
Southern Hemisphere ◽  
Ozone Concentration ◽  
Temporal Structure ◽  
The Other ◽  
Trace Gas ◽  
Homogeneity Test ◽  
Concentration Data ◽  
Ozone Data ◽  
Ozone Trend

Abstract. Ozone is a very important trace gas in the stratosphere and thus we need to know its time evolution over the globe. The ground based measurements are rare, especially in the Southern Hemisphere. Satellite ozone data have broader coverage, but they are not available from everywhere. On the other hand, the reanalyse data have regular spatial and temporal structure, which is very good for trend analyses. But there are discontinuities in these data.These discontinuities may influence the result of trend studies. The aim of this paper is to detect the discontinuity occurrence (DO) in the following reanalyses: MERRA-2, ERA-5 and JRA-55 with the help of the Pettitt homogeneity test at all common layers above 500 hPa. The discontinuities are sorted according to their size to the significant and the insignificant ones; the former can affect the ozone trend studies. It was shown that DO for the significant discontinuities is the smallest in JRA-55. In the upper model layers, the discontinuity occurrence is the highest. The other area of high DO is the troposphere.

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 FORECASTING OZONE CONCENTRATION DATA: ARIMA V/S LSTM

2019 ◽  
Vol 04 (04) ◽  
pp. 378-382
Author(s):  
Harguna Sood ◽  
Devanshu Narula ◽  
Prashant Singh Rana
Keyword(s):  
Ozone Concentration ◽  
Concentration Data

scholarly journals Discontinuities in the Ozone Concentration Time Series from MERRA 2 Reanalysis

Atmosphere ◽  
2019 ◽  
Vol 10 (12) ◽  
pp. 812 ◽  
Author(s):  
Peter Krizan ◽  
Michal Kozubek ◽  
Jan Lastovicka
Keyword(s):  
Time Series ◽  
Trend Analysis ◽  
Ozone Concentration ◽  
Homogeneity Test ◽  
Concentration Data ◽  
Trend Analyses ◽  
Earth Observing System ◽  
Concentration Time ◽  
Concentration Time Series ◽  
Modern Era

Artificial discontinuities in time series are a great problem for trend analysis because they influence the values of the trend and its significance. The aim of this paper is to investigate their occurrence in the Modern-Era Retrospective analysis for Research and Applications, version 2 (MERRA 2) ozone concentration data. It is the first step toward the utilization of the MERRA 2 ozone data for trend analysis. We use the Pettitt homogeneity test to search for discontinuities in the ozone time series. We showed the data above 4 hPa are not suitable for trend analyses due to the unrealistic patterns in an average ozone concentration and due to the frequent occurrence of significant discontinuities. Below this layer in the stratosphere, their number is much smaller, and mostly, they are insignificant, and the patterns of the average ozone concentration are explainable. In the troposphere, the number of discontinuities increases, but they are insignificant. The transition from Solar Backscatter Ultraviolet Radiometer (SBUV) to Earth Observing System (EOS) Aura data in 2004 is visible only above 1 hPa, where the data are not suitable for trend analyses due to other reasons. We can conclude the MERRA 2 ozone concentration data can be used in trend analysis with caution only below 4 hPa.

DETERMINATION OF THE BEST PROBABILITY DISTRIBUTION OF FIT FOR OZONE CONCENTRATION DATA IN CAMPO GRANDE-MS-BRAZIL

2019 ◽  
Vol 8 (9) ◽  
pp. 291
Author(s):  
Amaury De Souza ◽  
Bulbul Jan ◽  
Faisal Nawaz ◽  
Muhamamd Ayub Khan Yousuf Zai ◽  
Soetania Santos De Oliviera ◽  
...  
Keyword(s):  
Probability Distribution ◽  
Ozone Concentration ◽  
Concentration Data
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