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ABSTRACT Santiago de Chile is one of the most polluted South American cities, concentrating its pollution episodes during winter. Daily [PM.sub.2.5] (particulate matter [PM] ≤ 2.5 µm in aerodynamic diameter) [...]

ABSTRACT The impact of outdoor and indoor pollution sources on indoor air quality in Santiago, Chile was investigated. Toward this end, 16 homes were sampled in four sessions. Each session [...]

ABSTRACT Santiago, Chile, is one of the most polluted cities in South America. As a response, over the past 15 yr, numerous pollution reduction programs have been implemented by the [...]

ABSTRACT Daily particle samples were collected in Santiago, Chile, at four urban locations from January 1, 1989, through December 31, 2001. Both fine PM with [d.sub.a] ********** INTRODUCTION Santiago, Chile, [...]

ABSTRACT The optical absorption coefficient, particulate matter with an aerodynamic diameter The data also show an increase in P[M.sub.2.5] and EC concentration during winter and an increase in the ratio [...]

An activated-charcoal diffusion denuder was utilized on samples of organic aerosol collected in Santiago de Chile in order to strip out organic vapors before particle collection. Gas chromatography/mass spectrometry was used to determine aliphatic hydrocarbons and polynuclear aromatic hydrocarbons (PAHs). PAHs have been focused on for many years because of their mutagenic and carcinogenic properties.

In November and December 1996 the PHOTOCHEMICAL CAMPAIGN took place in the Metropolitan Area of Santiago de Chile and covered a range of simultaneous measurements of meteorological parameters and air chemical compounds, including ozone, carbon monoxide, nitrogen oxides, peroxyacetyl nitrate (PAN), and online nonmethane hydrocarbons (NMHC) in the range of [C.Sub.4]-[C.sub.12]. Measurements we, e obtained at a downtown site and a receptor site. In addition to high ozone concentrations, Santiago faces high PAN values that can reach to more than 20 ppbv. It is estimated that more than 50% of the daytime maximum of ozone and almost all PAN are formed within the urban plume. Ozone:PAN ratios for diurnal maxima were about 7.7. The behavior of PAN is linked strongly to anthropogenic species, especially aromatic compounds, whereas biogenic NMHC also may contribute to afternoon ozone concentrations. The ethylbenzene:m-xylene ratio can be used as a good indicator for the effect of anthropogenically related hydrocarbon chemical reactions that lead to the formation of secondary pollutants. Using this ratio, mixing ratios for hydroxyl radical (OH) were calculated. Mean diurnal maximum OH mixing ratios were about 2.9 x [10.sup.6] molecules per centimeter cubed.