Air pollution “holiday effect” resulting from the Chinese New Year

Tan, Pei‐Hua; Chou, Chia; Liang, Jing-Yi; Chou, Charles C.‐K.; Shiu, Chengshi

doi:10.1016/j.atmosenv.2009.01.037

Cited by 96 publications

(79 citation statements)

References 40 publications

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“…Although the urban population and geographical locations differ much, the temporal features of the three major pollutants in the CSF periods are similar among cities. These features are also similar to Tan et al 's [] finding of a general reduction in PM 10 , SO 2 , and NOx in the CSF periods around the urban area of Taipei during 1994–2006. The abruptly soaring concentrations of PM 10 and SO 2 on day 0, however, notably differ from those of NO 2 .…”

Section: Resultsmentioning

confidence: 99%

Observed holiday aerosol reduction and temperature cooling over East Asia

et al. 2014

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The air pollution in Chinese Spring Festival (CSF) period over eastern China was investigated using the long-term observations from 2001 to 2012 over 323 stations. The dominant feature of the pollutants around the CSF holidays is the significant reduction of concentration. During the 10 day period around the CSF (but excluding the Lunar New Year's Day, LNYD), PM 10 experiences a reduction of −9.24%. In association with the aerosol reduction, temperature significantly drops over eastern China. From the third day before the LNYD to the second day after, the daily mean temperature anomaly is −0.81 • C, respectively. From the third day to seventh day after the LNYD, the significant negative temperature anomalies move out of China, extending to a broad area from the South China Sea to the western North Pacific. Between the 8th and the 12th days, the significant temperature anomalies can still be found over 140 • N. The reduced downward longwave flux might play an important role in holiday cooling. The possible atmospheric feedback is discernable. The thermal and circulation configuration accompanying the cooling favors baroclinic interaction between upper and lower troposphere for the midlatitude cyclone. The anomalous cyclone becomes mature during the third to the seventh day after the LNYD and disappears 12 days later. The anomalous northern winds in association with the cyclone decrease the temperature and also help disperse the holiday aerosols over eastern China.

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Section: Resultsmentioning

confidence: 99%

Observed holiday aerosol reduction and temperature cooling over East Asia

et al. 2014

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“…No significant difference was observed in the annual average profiles for weekdays and weekend at AL and AN sites (corroborated by t ‐test analysis). The study of O x has advantages, because its concentration stays invariant during the titration process of O 3 by NO and also during the photo‐dissociation of NO 2 14, 25, 30. This means that the difference between the O 3 concentrations observed at weekdays and weekend is associated with the titration of O 3 by NO.…”

Section: Resultsmentioning

confidence: 99%

Ozone Weekend Effect Analysis in Three European Urban Areas

Pires

2012

CLEAN Soil Air Water

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Ozone Weekend Effect Analysis in Three European Urban AreasThis paper aims to apply statistical procedures to analyse the ozone weekend effect (OWE) in three European urban areas: Lisbon, Oporto and London. Seasonal variations of surface ozone (O 3 ) and total oxidant species (O x ) concentrations are presented. The studied period was from January 2007 to December 2009. The O 3 annual average profile in London was significantly different from the ones achieved for Lisbon and Oporto, due to the high emissions of nitrogen oxides and low temperatures (associated with low solar radiations). The influence of nitrogen oxides in atmospheric chemistry of London was analysed by linear correlations between O 3 concentrations and NO 2 /NO ratio. High values during almost all period showed that O 3 concentrations are mainly influenced by NO-NO 2 -O 3 chemical reaction. On the other hand, the linear correlations between O 3 and NO 2 concentrations only presented positive values in Lisbon and Oporto. This behaviour is associated with photo-dissociation of NO 2 , producing O 3 during the spring and summer periods. Additionally, cluster analysis was applied to group the days of week according the correspondent O 3 behaviour. The weekend and some weekdays (immediately after or before) were grouped in the same cluster, showing that OWE occurs in all urban areas selected in this study. These findings suggest that the applied statistical procedures should be used to analyse the OWE and that the causes for the different O 3 behaviours during the week may be influenced by meteorological variables.Abbreviations: AQMN, air quality monitoring networks; CA, cluster analysis; OWE, ozone weekend effect; VOCs, volatile organic compounds 790

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“…The anthropogenic source of NO x , primarily originating in fuel combustion, accounts for about 65% of the global total NO x emission, the rest being due to emissions from vegetation fires, lightning, and soils. Due to their link with human activities, NO x atmospheric levels over cities show a weekly cycle with clear minima during the official rest days in most countries (Beirle et al, 2003); important reductions were also reported during public holidays, like the Chinese New Year (Tan et al, 2009). Due to their adverse health effects, the emissions of NO x and other pollutants are regulated in many countries.…”

Section: Introductionmentioning

confidence: 99%

Impact of Coronavirus Outbreak on NO₂ Pollution Assessed Using TROPOMI and OMI Observations

Bauwens

Compernolle

Stavrakou

et al. 2020

Geophysical Research Letters

581

452

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Spaceborne NO2 column observations from two high‐resolution instruments, Tropospheric Monitoring Instrument (TROPOMI) on board Sentinel‐5 Precursor and Ozone Monitoring Instrument (OMI) on Aura, reveal unprecedented NO2 decreases over China, South Korea, western Europe, and the United States as a result of public health measures enforced to contain the coronavirus disease outbreak (Covid‐19) in January–April 2020. The average NO2 column drop over all Chinese cities amounts to −40% relative to the same period in 2019 and reaches up to a factor of ~2 at heavily hit cities, for example, Wuhan, Jinan, while the decreases in western Europe and the United States are also significant (−20% to −38%). In contrast with this, although Iran is also strongly affected by the disease, the observations do not show evidence of lower emissions, reflecting more limited health measures.

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Air pollution “holiday effect” resulting from the Chinese New Year

Cited by 96 publications

References 40 publications

Observed holiday aerosol reduction and temperature cooling over East Asia

Observed holiday aerosol reduction and temperature cooling over East Asia

Ozone Weekend Effect Analysis in Three European Urban Areas

Impact of Coronavirus Outbreak on NO₂ Pollution Assessed Using TROPOMI and OMI Observations

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Air pollution “holiday effect” resulting from the Chinese New Year

Cited by 96 publications

References 40 publications

Observed holiday aerosol reduction and temperature cooling over East Asia

Observed holiday aerosol reduction and temperature cooling over East Asia

Ozone Weekend Effect Analysis in Three European Urban Areas

Impact of Coronavirus Outbreak on NO2 Pollution Assessed Using TROPOMI and OMI Observations

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Impact of Coronavirus Outbreak on NO₂ Pollution Assessed Using TROPOMI and OMI Observations