Dynamics-aerosol-chemistry-cloud interactions in West Africa
Urban measurements
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WP2 team is engaged in four intensive campaigns, two during the wet season (July 2015/2016) and two during the dry season January 2016/2017). The campaings focus on the 4 sites representative of the main specific SWA combustion sources: traffic at Adjamé site in Abidjan (Côte d’Ivoire) and at Dantokpa site in Cotonou (Benin), domestic fires at Yopougon site (Abidjan) and waste burning at Akouedo (Abidjan).


A roadsite site in Abidjan (Côte d'Ivoire)
© C. Liousse

A roadsite site in Cotonou (Benin)
© C. Liousse

A waste burning site in Akouedou (Côte d'Ivoire)
© C. Liousse
 
A domestic burning site in Abidjan (Côte d'Ivoire)
© C. Liousse

Instrumentation

 
Traffic site Abidjan © C. Liousse
 
Waste burning site © C. Liousse
 
domestic fire site © C. Liousse
 
traffic site Cotonou © C. Liousse

Objectives are:

(1) to calculate in situ dose-inflammatory response ratios for each studied source. Air pollution experiments include three impactors running in parallel three times in each campaign in the same conditions, in order to determine aerosol chemical composition and their pro-oxidant capacity by size as well as in vitro inflammatory biomarkers to derive inflammatory response. As an example, the picture below shows collection of filters after sampling and more specially the black-coloured filter linked to ultra fine size collection.

(2) to assess personal exposures to PM2.5 and aerosol chemistry emitted from domestic fire emissions for housewife, waste burning emissions for student and motor vehicle emissions for drivers. Participants are equipped with personal impactors and followed three consecutive days (night and day).

(3) to measure emission factors for gases and particles for the main African specific urban sources (domestic fires with different woods and charcoal, charcoal making and many representative two and four wheels) in real ground conditions.

(4) to establish spatial distribution of gaseous components (NO2, Ozone) in Abidjan and Cotonou during the dry seasons 2015 and 2016 with multi sites deployment of passive samplers.

In parallel to these intensive measurements, long-term experiments are also active from December 2014 to March 2017 including on the four sites: air pollution measurements with weekly aerosol collection for PM2.5 mass, black carbon and organic carbon, pro-oxydant aerosol capacity, bimonthly gas collection for ozone, nitrogen dioxide, ammonia, nitric acid and sulphur dioxide and aerosol optical depths (AOD) and epidemiological survey with census of hospital admission for respiratory diseases and morbidity at the hospital or health centers close to our four experimental sites.

In the experiments more than 20 persons working on the collected data in France, Côte d’Ivoire and Benin including 4 PhD students.


Filters with aerosol impactors © Sébastien Chastanet
 
WP2-task 2-3 workshop in Abidjan © C. Liousse