Surface ozone variation associated with rainfall

Muralidharan, V.; Kumar, Gajendra; Sampath, S.

doi:10.1007/bf00877736

Cited by 8 publications

(4 citation statements)

References 28 publications

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“…The results agree with studies by Ayoma et al (2004) and Muthama (1989). The observation could therefore be attributed to wet deposition of ozone molecules, in agreement with Muralidharan et al (1989) and Lin et al (2009). Muralidharan et al (1989) studied the effects of rainfall on ozone in Trivandrum, India.…”

Section: Resultssupporting

confidence: 69%

Observed surface ozone trend in the year 2012 over Nairobi, Kenya

Shilenje

Ongoma

2015

ATM

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Clean air is a basic requirement for human health and wellbeing. The Kenya Meteorological Department has established air pollution monitoring activities in various sites in Nairobi, at Dagoretti Corner meteorological station and at Mount Kenya. Different pollutants are measured including ozone. The increased concentration of greenhouse gases in the atmosphere has influenced the weather and climate. This study examined the variations of surface ozone over Dagoretti Corner, Nairobi for a 12-month period ending July 2013, exactly one year after the start of data acquisition. The trend was studied using time series analysis of ozone concentration on both an hourly and monthly basis. The ozone data was then combined with meteorological data and temperature to find correlations between the two. Overall, the air quality of Nairobi, represented by Dagoretti Corner meteorological station is good as compared to the World Meteorological Organization ozone standards. The highest concentration of ozone is observed in the afternoon and the minimum at dawn on a daily basis. On seasonal scale, the highest levels are recorded in the cold months. This information helps to reduce exposure to the gas and thus to reduce its impacts on living things. The study recommends the reduction of exposure to the gas during the times when it has been observed to be highest in order to minimize its impacts

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Section: Resultssupporting

confidence: 69%

Observed surface ozone trend in the year 2012 over Nairobi, Kenya

Shilenje

Ongoma

2015

ATM

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“…Their concentrations tended to increase somewhat under rainy conditions. This is likely due to vertical mixing, bringing down a certain amount of O 3 and NO 2 from the upper layers of the atmosphere during convective rain activity and thunderstorms [38][39][40][41][42]. Surface NO 2 concentrations can also be enhanced by lightning-generated NO 2 during convective rain events [43][44][45].…”

Section: Pollutantmentioning

confidence: 99%

Contrasting Trends of Surface PM2.5, O3, and NO2 and Their Relationships with Meteorological Parameters in Typical Coastal and Inland Cities in the Yangtze River Delta

Jiang

et al. 2021

IJERPH

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The contrasting trends of surface particulate matter (PM2.5), ozone (O3), and nitrogen dioxide (NO2) and their relationships with meteorological parameters from 2015 to 2019 were investigated in the coastal city of Shanghai (SH) and the inland city of Hefei (HF), located in the Yangtze River Delta (YRD). In both cities, PM2.5 declined substantially, while O3 and NO2 showed peak values during 2017 when the most frequent extreme high-temperature events occurred. Wind speed was correlated most negatively with PM2.5 and NO2 concentrations, while surface temperature and relative humidity were most closely related to O3. All of the studied pollutants were reduced by rainfall scavenging, with the greatest reduction seen in PM2.5, followed by NO2 and O3. By contrast, air pollutants in the two cities were moderately strongly correlated, although PM2.5 concentrations were much lower and Ox (O3 + NO2) concentrations were higher in SH. Additionally, complex air pollution hours occurred more frequently in SH. Air pollutant concentrations changed more with wind direction in SH. A more effective washout effect was observed in HF, likely due to the more frequent strong convection and thunderstorms in inland areas. This research suggests pertinent air quality control measures should be designed accordingly for specific geographical locations.

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“…The observation could therefore be attributed to wet deposition of ozone molecules, in agreement with Muralidharan et al (1989) and Lin et al (2009). Muralidharan et al (1989) studied the effects of rainfall on ozone in Trivandrum, India. The study isolated a correlation between daytime rainfall and lower surface ozone levels.…”

Section: Resultsmentioning

confidence: 48%

Observed surface ozone trend in the year 2012 over Nairobi, Kenya

Shilenje¹,

Ongoma²

2014

Atmósfera

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El aire limpio es un requerimiento básico para la salud y el bienestar humanos. El Servicio Meteorológico de Kenia ha iniciado acciones de medición de contaminación del aire en varios sitios de Nairobi, en el Centro Meteorológico de Dagoretti Corner y en el monte Kenia. Se miden diversos contaminantes, incluyendo el del inicio de la obtención de datos. Para estudiar la tendencia se analizaron series de tiempo horarias y mensuales de la concentración de ozono. Los datos de ozono se correlacionaron con datos meteorológicos y de temperatura. En términos generales, se encontró que la calidad del aire en Nairobi (representada por la estación meteorológica de Dagoretti Corner) es buena de acuerdo con los estándares de la Organización Meteorológica Mundial. La mayor concentración de ozono se observó durante la tarde y la mínima al amanecer. En una escala estacional, los niveles más altos se observaron en los meses fríos. Esta información ayuda a reducir la exposición al gas y por lo tanto a disminuir sus efectos sobre los seres vivos. Se recomienda la reducción de la exposición al ozono en los tiempos en que se han observado mayores concentraciones para minimizar su impacto. ABSTRACTClean air is a basic requirement for human health and wellbeing. The Kenya Meteorological Department has established air pollution monitoring activities in various sites in Nairobi, at Dagoretti Corner meteorological station and at Mount Kenya. Different pollutants are measured including ozone. The increased examined the variations of surface ozone over Dagoretti Corner, Nairobi for a 12-month period ending July 2013, exactly one year after the start of data acquisition. The trend was studied using time series analysis of ozone concentration on both an hourly and monthly basis. The ozone data was then combined with merepresented by Dagoretti Corner meteorological station is good as compared to the World Meteorological Organization ozone standards. The highest concentration of ozone is observed in the afternoon and the minimum at dawn on a daily basis. On seasonal scale, the highest levels are recorded in the cold months. This information helps to reduce exposure to the gas and thus to reduce its impacts on living things. The study recommends the reduction of exposure to the gas during the times when it has been observed to be highest in order to minimize its impacts.

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Surface ozone variation associated with rainfall

Cited by 8 publications

References 28 publications

Observed surface ozone trend in the year 2012 over Nairobi, Kenya

Observed surface ozone trend in the year 2012 over Nairobi, Kenya

Contrasting Trends of Surface PM2.5, O3, and NO2 and Their Relationships with Meteorological Parameters in Typical Coastal and Inland Cities in the Yangtze River Delta

Observed surface ozone trend in the year 2012 over Nairobi, Kenya

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