Ground level ozone concentrations and its association with NOx and meteorological parameters in Kathmandu valley, Nepal

Pudasainee, Deepak; Sapkota, Balkrishna; Shrestha, Manish; Kaga, Akikazu; Kondo, Akira; Inoue, Yoshio

doi:10.1016/j.atmosenv.2006.07.011

Cited by 156 publications

(151 citation statements)

References 15 publications

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“…Pudasainee and colleagues [37] have found that solar radiation is one of the parameters that have the largest influence on formation of ozone during daylight hours; the correlation coefficient is 0.86.…”

Section: Resultsmentioning

confidence: 99%

Surface Ozone Concentration and Its Relationship with UV Radiation, Meteorological Parameters and Radon on the Eastern Coast of the Baltic Sea

et al. 2016

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Abstract:Hourly and daily variations of ground-level ozone have been analyzed in relation to meteorological parameters, UVB radiation and radon near the Baltic Sea in Lithuania. An atypical situation with respect to wind domination was observed during the experiment: the wind from the continent was twice as frequent as the wind from the sea. The close correlation between ground-level ozone concentration and UVB radiation intensity was established. The vertical migration directions of ozone and radon were opposite and the negative correlation between these pollutants was observed. The diurnal course of ozone and radon and the influence of meteorological parameters (temperature, relative air humidity, wind speed and direction) on variation of these pollutants have been estimated. It was established that the wind direction domination during the experiment had a significant influence on the variation of ozone and radon concentrations.

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Section: Resultsmentioning

confidence: 99%

Surface Ozone Concentration and Its Relationship with UV Radiation, Meteorological Parameters and Radon on the Eastern Coast of the Baltic Sea

et al. 2016

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“…In Sao Paulo in Brazil, the increased MLH and the enhanced wind speeds could promote the dilution of surface ozone and resulted in the decrease of ozone levels (SachezCcoyllo et al, 2006). The ozone levels during the premonsoon were observed to be significantly higher than the values during the monsoon in Thailand and Nepal (Zhang and Kim Oanh, 2002;Pudasainee et al, 2006). During the premonsoon, the metrological conditions of high air temperature, strong solar radiation and lack of rainfall could give rise to the accumulation of ground-level ozone.…”

Section: Introductionmentioning

confidence: 98%

“…In many studies, the meteorological conditions have been recognized as the important factors controlling the levels of some regular air pollutants such as ozone, NO X , SO 2 , CO 2 , and particulate matter (PM 10 , PM 2.5 , PM 1 ), etc. (Sezer et al, 2005;Pudasainee et al, 2006;Seto and Hara, 2006;Alves, 2008;Pateraki et al, 2008). In Sao Paulo in Brazil, the increased MLH and the enhanced wind speeds could promote the dilution of surface ozone and resulted in the decrease of ozone levels (SachezCcoyllo et al, 2006).…”

Section: Introductionmentioning

confidence: 99%

Influences of characteristic meteorological conditions on atmospheric carbonyls in Beijing, China

Pang

Lee

et al. 2009

Atmospheric Research

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Atmospheric pollutants are controlled not only by their production rates but also by meteorological conditions. The influences of dust storm, sauna weather (haze with high temperature and high humidity), wet precipitation and wind speed on atmospheric carbonyls in Beijing were investigated. During a severe dust episode (April 17, 2006), the mixing ratios of carbonyls were significantly elevated to 13-27 ppbV from 7 to 13 ppbV in the previous non-dust days (April 15 and 16) with the increasing extents of 38-154%. The accumulating effect and the lower photolysis rate in the dust day may be responsible for the increases of carbonyls' levels. Additionally, the contribution from heterogeneous reactions occurring on dust particles to formaldehyde and acetaldehyde cannot be ruled out. During the period of typical sauna weather, the concentrations of atmospheric carbonyls increased to 18-60 ppbV from 10 to 17 ppbV before the sauna days. The air mass over Beijing during the sauna days was controlled by a subtropical anticyclone and the boundary layer became quite stable, which was beneficial to the rapid accumulation of air pollutants including carbonyls. Wet precipitation was found to be an effective removal process to the atmospheric carbonyls. After one-hour of rain in summer, the total concentrations of atmospheric carbonyls decreased to less than half of that before the rainfall. The similar temporal varying patterns of carbonyls and inorganic ions in rainwater indicated that carbonyls were mainly washed out from the atmosphere into rainwater as inorganic ions were. Strong wind could evidently dilute atmospheric carbonyls and a negative correlation was found between wind speeds and the concentrations of carbonyls in spring in Beijing.

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“…Furthermore concentration of SO 2 from motor vehicles has been found in higher concentration in winter months followed by summer and monsoon months (Goyal et al, 2006;Emberson et al, 2009), also in Industrial areas (Reddy and Ruj, 2003). But apart from the Industrial and vehicular exhausts (SO x , NO x and PM), fumes from brick kilns also contribute to the increase in the level of local O 3 at surface levels (Pudasainee et al, 2006). It has been revealed that biomass is responsible for the emission of both trace and non trace gases such as CO 2 , CH 4 , N 2 O, NO x and NO from traditional brick Industries and lots of toxic fumes containing SPM rich in carbon particles and high concentration of CO and SO x get produced (Alam, 2006).…”

Section: Sources Of Air Pollutantsmentioning

confidence: 99%

Brick kiln emissions and its environmental impact: A Review

Skinder¹,

Sheikh²,

Pandit³

et al. 2014

J. Ecol. Nat. Environ.

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Brick manufacturing is the fastest-growing industrial sector in many countries (like china, India, Bangladesh and Pakistan) and among the top three sectors, along with vehicle exhaust and resuspended road dust, contributing to the air pollution and health problems in Dhaka (Bangladesh). The total emissions from the brick manufacturing in the Greater Dhaka region, to produce 3.5 billion bricks per year has been estimated about 23,300 tons of particulate matter having aerodynamic diameter < 2.5 μm (PM 2.5 ), 15,500 tons of sulfur dioxide (SO 2 ), 302,000 tons of carbon monoxide (CO), 6,000 tons of black carbon (BC) and 1.8 million tons of carbon dioxide (CO 2 ) . Emission of individual air pollutant from brick kilns varied significantly during a firing batch (seven days) and between kilns. Average emission factors per 1,000 bricks were 6.35 to 12.3 kg of CO, 0.52 to 5.9 kg of SO 2 and 0.64 to 1.4 kg of particulate matter (PM). Presently sulphur dioxide (SO 2 ), oxides of nitrogen (NO x ) and suspended particulate matter (SPM) are the main issue pertaining to air pollution problems in developing countries, where it contributes both to urban pollution and to regional acid depositions. Among man-made sources, coal combustion in stationary sources accounts for 74%, industries 22% and transportation 2% of the total oxides of sulphur (SO x ) . and it is considered that SO 2 is the chief emission in brick production. On an international basis, 75 to 85% of SO 2 emissions are the result of fossil fuel burning. It is predictable that just about 93% of the global SO 2 emissions are emitted in the northern hemisphere. It has been revealed that biomass is responsible for the emission of both trace and non trace gases such as carbon dioxide (CO 2 ), methane (CH 4 ) and oxides of nitrogen (NO x ) from traditional brick industries and lots of toxic fumes containing suspended particulate matters rich in carbon particles and high concentration of CO and SO x get produced. Studies have shown the average value of particulate matter of size less than ten microns and total suspend particles for the preoperation time of brick kilns was 0.029 and 0.033 mg/m³, respectively whereas, it reached 0.050 and 0.056 mg/m³, respectively during the brick kiln operation time. Similarly, recent studies on brick kilns in District Budgam of Kashmir valley (India) have shown some major negative impacts on the environment in respect of air quality, human health and vegetation in particular.

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Ground level ozone concentrations and its association with NOx and meteorological parameters in Kathmandu valley, Nepal

Cited by 156 publications

References 15 publications

Surface Ozone Concentration and Its Relationship with UV Radiation, Meteorological Parameters and Radon on the Eastern Coast of the Baltic Sea

Surface Ozone Concentration and Its Relationship with UV Radiation, Meteorological Parameters and Radon on the Eastern Coast of the Baltic Sea

Influences of characteristic meteorological conditions on atmospheric carbonyls in Beijing, China

Brick kiln emissions and its environmental impact: A Review

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