A study of tropospheric NO2 variability over Pakistan using OMI data

Ul-Haq, Zia; Tariq, Salman; Ali, M. Tanseer; Mahmood, Khalid; Batool, Sana; Rana, Asim Daud

doi:10.5094/apr.2014.080

Cited by 55 publications

(25 citation statements)

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“…Journal of Geophysical Research: Atmospheres 10.1002/2015JD024121 smaller NO 2 changes from 2005 to 2014 than those of Ghude et al [2008Ghude et al [ , 2011 and Ramachandran et al [2013], which we attribute to referencing different base years and using finer resolution data in our analysis. We find spatial heterogeneity in the changes in the cities of New Delhi and the Mumbai-Gujarat industrial corridor with decreases or insignificant changes in the city centers and increases outside of the city centers.…”

Section: 1002/2015jd024121mentioning

confidence: 97%

“…Several researchers have previously reported South Asian emission hot spots (i.e., urban and industrial areas and thermal power plants) and increasing NO 2 changes, using data with relatively coarse spatial resolutions from a number of satellite sensors [ Ghude et al , ; Lu and Streets , ; Ramachandran et al , ; ul‐Haq et al , ]. The largest hot spots are found over thermal power plants [ Lu and Streets , ; Prasad et al , ], such as the Chhattisgarh region (Figure ) because coal is fueling India's economic boom [e.g., Guttikunda and Jawahar , ; USEIA , ].…”

Section: Changes In No2 Levels Around the Globementioning

confidence: 99%

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A space‐based, high‐resolution view of notable changes in urban NO_x pollution around the world (2005–2014)

et al. 2016

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Nitrogen oxides (NOx = NO + NO2) are produced during combustion processes and, thus may serve as a proxy for fossil fuel‐based energy usage and coemitted greenhouse gases and other pollutants. We use high‐resolution nitrogen dioxide (NO2) data from the Ozone Monitoring Instrument (OMI) to analyze changes in urban NO2 levels around the world from 2005 to 2014, finding complex heterogeneity in the changes. We discuss several potential factors that seem to determine these NOx changes. First, environmental regulations resulted in large decreases. The only large increases in the United States may be associated with three areas of intensive energy activity. Second, elevated NO2 levels were observed over many Asian, tropical, and subtropical cities that experienced rapid economic growth. Two of the largest increases occurred over recently expanded petrochemical complexes in Jamnagar (India) and Daesan (Korea). Third, pollution transport from China possibly influenced the Republic of Korea and Japan, diminishing the impact of local pollution controls. However, in China, there were large decreases over Beijing, Shanghai, and the Pearl River Delta, which were likely associated with local emission control efforts. Fourth, civil unrest and its effect on energy usage may have resulted in lower NO2 levels in Libya, Iraq, and Syria. Fifth, spatial heterogeneity within several megacities may reflect mixed efforts to cope with air quality degradation. We also show the potential of high‐resolution data for identifying NOx emission sources in regions with a complex mix of sources. Intensive monitoring of the world's tropical/subtropical megacities will remain a priority, as their populations and emissions of pollutants and greenhouse gases are expected to increase significantly.

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Section: 1002/2015jd024121mentioning

confidence: 97%

Section: Changes In No2 Levels Around the Globementioning

confidence: 99%

A space‐based, high‐resolution view of notable changes in urban NO_x pollution around the world (2005–2014)

et al. 2016

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“…Some hot spots clearly show a relation with high traffic areas, although someones with industrial areas. One major source of high values of NO2 is the usage of diesel and petrol generators for electricity during the electric power outage in industries or local commerce (ul-Haq et al, 2014). Thus, the highest values corresponded to industries because of the significant electrical blackouts in the study area.…”

Section: Resultsmentioning

confidence: 95%

Assessment of the NO2 distribution and relationship with traffic load in the Caribbean coastal city

Agudelo-Castañeda

Paoli²,

Gamero

et al. 2020

Science of The Total Environment

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NO2 ambient concentrations were measured in a coastal Caribbean city. Barranquilla is a Caribbean city located in the North of Colombia that has approximately 1.200.000 inhabitants and possesses a warm, humid climate. In order to obtain the concentration of the contaminant in an adequate resolution, 137 passive diffusion tubes from Gradko© were installed. Diffusion passive tubes prepared with 20% TEA/water were located at the roadside between 1 and 5 m from the kerb edge. The sampling period was two weeks, from 3/16/2019 to 3/30/2019. Samples were analyzed on the UV CARY1 spectrophotometer by Gradko©. Results showed an average of 19.92 ±11.50 µg/m 3 , with a maximum and minimum value of 70.27 and 0.57 µg/m 3 , respectively. Spatial NO2 correlation with low traffic load was higher than with maximum traffic. The expected results include analyzing the areas of the city with high concentrations of this pollutant that exceed the WHO guidelines in six (6) points. Overall, the multiregression analysis is a very effective method to enrich the understanding of NO2 distributions. It can provide scientific evidence for the relationship between NO2 and traffic, beneficial for developing the targeted policies and measures to reduce NO2 pollution levels in hot spots. This research may subsidize knowledge to serve as a tool for environmental and health authorities.

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“…A winter season high with a peak in December 1.07 × 10 15 molec/cm 2 , is due to meteorology (weak winds and dry weather conditions), heavy usage of biomass fuel for wintertime home heating especially in the northern areas, and less UV radiations available for the initialization of photolysis reactions that break down NO 2 [8,20,74,75]. In winter, shallower boundary layer results in lower vertical dispersion which reduces the dilution and removal rates of NO 2 .…”

Section: Temporal Distribution Of Nomentioning

confidence: 99%

“…However, a few studies have been conducted only on some parts of South Asia to investigate spatiotemporal variations and to identify NO 2 emission hotspots using satellite remote sensing technique [15][16][17][18][19][20]. Recently, Ul-Haq et al [20] assessed spatial and temporal patterns of NO 2 over Pakistan using Ozone Monitoring Instrument (OMI) retrieved data for the period 2004-2008. Renuka et al [19] analyzed long-term changes of tropospheric NO 2 over south India using retrievals from GOME/ERS-2 and OMI/Aura during 1996-2014.…”

Section: Introductionmentioning

confidence: 99%

Tropospheric NO₂Trends over South Asia during the Last Decade (2004–2014) Using OMI Data

Ul-Haq

Tariq

Ali

2015

Advances in Meteorology

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The focus of this study is to assess spatiotemporal variability of tropospheric NO2over South Asia using data from spaceborne OMI during the past decade (2004–2015). We find an average value of NO21.0 ± 0.05 × 1015 molec/cm2and a significant decadal increase of 14%. The elevating NO2pollution over the region is linked to rise in motor vehicles and industrial and agricultural activities and increase in biomass fuel usage. The observed seasonality of NO2is associated with change in meteorological conditions and seasonal cycles of anthropogenic emissions. OMI data reveal a seasonal peak in spring followed by winter largely linked to metrological conditions and anthropogenic emissions from crop residue and biomass burning for heating purpose, and low concentration in summer is mostly attributed to meteorological conditions. Significant increase, up to 42%, in NO2concentrations over northwestern IGB, is observed connected to large scale postmonsoon crop residue events of 2010 and 2012. It is seen that NO2is mounting over all the hotspot locations and most of the cities. Dhaka shows the highest increase of 77% followed by Islamabad (69%), Kabul (68%), Korba (64%), Bardhaman (47%), and Lahore (40%). On the contrary, DG Khan has shown negative trend of −11%.

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A study of tropospheric NO2 variability over Pakistan using OMI data

Cited by 55 publications

References 40 publications

A space‐based, high‐resolution view of notable changes in urban NO_x pollution around the world (2005–2014)

A space‐based, high‐resolution view of notable changes in urban NO_x pollution around the world (2005–2014)

Assessment of the NO2 distribution and relationship with traffic load in the Caribbean coastal city

Tropospheric NO₂Trends over South Asia during the Last Decade (2004–2014) Using OMI Data

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A study of tropospheric NO2 variability over Pakistan using OMI data

Cited by 55 publications

References 40 publications

A space‐based, high‐resolution view of notable changes in urban NOx pollution around the world (2005–2014)

A space‐based, high‐resolution view of notable changes in urban NOx pollution around the world (2005–2014)

Assessment of the NO2 distribution and relationship with traffic load in the Caribbean coastal city

Tropospheric NO2Trends over South Asia during the Last Decade (2004–2014) Using OMI Data

Contact Info

Product

Resources

About

A space‐based, high‐resolution view of notable changes in urban NO_x pollution around the world (2005–2014)

A space‐based, high‐resolution view of notable changes in urban NO_x pollution around the world (2005–2014)

Tropospheric NO₂Trends over South Asia during the Last Decade (2004–2014) Using OMI Data