W. Ait‐Helal

ORCID: 0009-0006-0125-2877
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About
Contact & Profiles
Research Areas
  • Atmospheric chemistry and aerosols
  • Air Quality Monitoring and Forecasting
  • Air Quality and Health Impacts
  • Vehicle emissions and performance
  • Atmospheric Ozone and Climate
  • Maritime Transport Emissions and Efficiency
  • Carbon Dioxide Capture Technologies
  • Transportation Planning and Optimization
  • Catalytic Processes in Materials Science
  • Advanced Chemical Sensor Technologies
  • Environmental Impact and Sustainability

Laboratoire Techniques, Territoires et Sociétés
2012-2017

Université Paris-Est Créteil
2012-2017

Institut de Combustion Aérothermique Réactivité et Environnement
2017

Centre National de la Recherche Scientifique
2012-2017

Institut Pierre-Simon Laplace
2012-2017

Laboratoire Interuniversitaire des Systèmes Atmosphériques
2012-2017

École des Mines de Douai
2011-2017

Université Paris Cité
2012-2017

Délégation Paris 7
2015

Université Lille Nord de France
2012-2014

Abstract. Nitrous acid measurements were carried out during the MEGAPOLI summer and winter field campaigns at SIRTA observatory in Paris surroundings. Highly variable HONO levels observed campaigns, ranging from 10 ppt to 500 1.7 ppb winter. Significant mixing ratios have also been measured daytime hours, comprised between some tenth of 200 for campaign few 1 campaign. Ancillary measurements, such as NOx, O3, photolysis frequencies, meteorological parameters (pressure, temperature, relative...

10.5194/acp-14-2805-2014 article EN cc-by Atmospheric chemistry and physics 2014-03-19

Abstract. Chemical Ionisation Mass Spectrometer measurements of hydroxyl radical (OH) and the sum hydroperoxy organic peroxy (HO2+RO2) radicals were conducted during MEGAPOLI summer field campaign at SIRTA observatory near Paris, France, in July 2009. OH showed a typical diurnal variation with averaged daytime maxima values around 5×106 1.2×108 molecule cm−3, respectively. Simultaneously, large number ancillary measurements, such as NOx, O3, HONO, HCHO other VOCs also conducted. These data...

10.5194/acp-12-11951-2012 article EN cc-by Atmospheric chemistry and physics 2012-12-17

Abstract. Measurements of gaseous and particulate organic carbon were performed during the MEGAPOLI experiments, in July 2009 January–February 2010, at SIRTA observatory suburban Paris. comprise primary secondary volatile compounds (VOCs), both anthropogenic biogenic origins, including C12–C16 n-alkanes intermediate volatility (IVOCs), suspected to be efficient precursors aerosol (SOA). The time series are generally consistent with times regional scale, clearly affected by meteorology air...

10.5194/acp-14-10439-2014 article EN cc-by Atmospheric chemistry and physics 2014-10-01

Abstract We performed a case study of the organic aerosol (OA) budget during MEGAPOLI campaign summer 2009 in Paris. combined mass spectrometer, gas phase chemistry, and atmospheric boundary layer (ABL) data applied MXL/MESSy column model. find that daytime, vertical mixing due to ABL growth has opposing effects on secondary (SOA) primary (POA) concentrations. POA concentrations are mainly governed by dilution expansion transport POA‐depleted air from aloft, while SOA enhanced entrainment...

10.1002/2016jd026402 article EN Journal of Geophysical Research Atmospheres 2017-06-21

Abstract. Measurements of hydroxyl (OH) and peroxy (RO2) radicals by a Chemical Ionisation Mass Spectrometer (CIMS) were conducted during the MEGAPOLI summer field campaign at SIRTA observatory near Paris, France, in July 2009. OH RO2 showed typical diurnal variation with averaged daytime maxima values around 5 × 106 1.2 108 molecule cm−3, respectively. Simultaneously, large number ancillary measurements, such as NOx, O3, HONO, HCHO other VOCs also conducted. These data provide an...

10.5194/acpd-12-15883-2012 preprint EN cc-by 2012-06-26

Abstract. Measurements of gaseous and particulate organic carbon were performed during the MEGAPOLI experiments, in July 2009 January–February 2010, at SIRTA observatory sub-urban Paris. primary secondary volatile compounds (VOCs), both anthropogenic biogenic origins, including for first time C12-C16 n-alkanes intermediate volatility (IVOCs), suspected to be efficient precursors aerosol (SOA). The series are generally consistent with times regional scales clearly affected by meteorology air...

10.5194/acpd-14-4841-2014 preprint EN cc-by 2014-02-21

Abstract. Nitrous acid measurements were carried out during the MEGAPOLI summer and winter field campaigns at SIRTA observatory in Paris surroundings. Highly variable HONO levels observed campaigns, ranging from 10 ppt to 500 1.7 ppb winter. Significant mixing ratios have also been measured daytime hours, comprised between some tenth of 200 for campaign few 1 campaign. Ancillary measurements, such as NOx, O3, photolysis frequencies, meteorological parameters (pressure, temperature, relative...

10.5194/acpd-13-23639-2013 preprint EN cc-by 2013-09-10
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