title: Characteristics of carbonaceous aerosols in ambient PM10 and PM2.5 particles in Dar es Salaam, Tanzania.
abstract: Ambient daytime and nighttime PM(10) and PM(2.5) samples were collected in parallel at a kerbside in Dar es Salaam in August and September 2005 (dry season) and in April and May 2006 (wet season). All samples were analyzed for the particulate matter mass, for organic, elemental, and total carbon (OC, EC, and TC), and for water-soluble OC (WSOC). The average PM(10) and PM(2.5) mass concentrations and associated standard deviations were 76+/-32microg/m(3) and 26+/-7microg/m(3) for the 2005 dry season and 52+/-27microg/m(3) and 19+/-10microg/m(3) for the 2006 wet season campaign. On average, TC accounted for 29% of the PM(10) mass and 49% of the PM(2.5) mass for the 2005 dry season campaign and the corresponding values for the 2006 wet season campaign were 35% and 59%. There was little difference between the two campaigns for the WSOC/OC ratios with the PM(2.5) fraction having higher ratios than the PM(10) fraction during each campaign. Also for EC/TC higher ratios were noted in PM(2.5) than in PM(10), but the ratios were substantially larger in the 2006 wet season than in the 2005 dry season. The large EC/TC ratios (means 0.22-0.38) reflect the substantial impact from traffic at Dar es Salaam, as was also apparent from the clear diurnal variation in OC levels, with higher values during the day. A simple source apportionment approach was used to apportion the OC to traffic and charcoal burning. On average, 70% of the PM(10) OC was attributed to traffic and 30% to charcoal burning in both campaigns. A definite explanation for the substantially larger EC/TC ratios in the 2006 campaign as compared to the 2005 campaign is not available.
authors.affiliation: Department of Physical Sciences, Faculty of Science, Sokoine University of Agriculture (SUA), Morogoro, Tanzania.
authors.forename: Stelyus L
authors.initials: SL
authors.lastname: Mkoma
authors.forename: Xuguang
authors.initials: X
authors.lastname: Chi
authors.forename: Willy
authors.initials: W
authors.lastname: Maenhaut
mesh_terms: D000336:Aerosols / Q000032:analysis* / Q000737:chemistry; D000393:Air Pollutants / Q000032:analysis* / Q000737:chemistry; D001272:Atmosphere / Q000737:chemistry*; D002244:Carbon / Q000032:analysis* / Q000737:chemistry; D004784:Environmental Monitoring / Q000379:methods; D007700:Kinetics; D009930:Organic Chemicals / Q000032:analysis; D010316:Particle Size; D052638:Particulate Matter / Q000032:analysis*; D012621:Seasons; D013636:Tanzania
chemical_list: D000336:Aerosols; D000393:Air Pollutants; D009930:Organic Chemicals; D052638:Particulate Matter; D002244:Carbon