scholarly journals Studies on Photochemical Reactions of Air Pollutants. XIV. Photooxidation of Sulfur Dioxide in Air by Various Air Pollutants

2004 ◽  
Vol 52 (3) ◽  
pp. 335-338 ◽  
Author(s):  
Kazuhiro Nojima ◽  
Yasuko Yamaashi
Keyword(s):  
Sulfur Dioxide ◽  
Air Pollutants ◽  
Photochemical Reactions

scholarly journals Observations of air composition in Brazil between the Equator and 20°s during the dry season.

1985 ◽  
Vol 15 (1-2) ◽  
pp. 77-120 ◽  
Author(s):  
P.J. Crutzen ◽  
M.T. Coffey ◽  
A.C. Delany ◽  
J. Greenberg ◽  
P. Haagenson ◽  
...  
Keyword(s):  
Boundary Layer ◽  
Carbon Monoxide ◽  
Tropical Forests ◽  
Air Pollutants ◽  
Trace Gases ◽  
Dry Season ◽  
Photochemical Reactions ◽  
Ozone Concentrations ◽  
Air Chemistry ◽  
High Concentrations

Field measurement programs in Brazil during the dry season months of August and September in 1979 and 1980 have demonstrated the great importance of the continental tropics in global air chemistry. Especially in the mixed layer, the air composition over land is much different from that over the ocean and the land areas are clearly longe scale sources of many inportant trace gases. During the dry season much biomass, burning takes place especially in the cerrado regions leading to substantial emission of air pollutants, such as CO, NOx, N2O, CH4 and other hydrocarbons. Ozone concentrations are alsoenhanced due to photochemical reactions. Biogenic organic emissions from tropical forests play likewise an important role in the photochemistry of the atmosphere. Carbon monoxide was found to be present in high concentrations in the boundary layer of the tropical forest, but ozone concentrations were much lower than in the cerrado.

Synergistic effect on field-grown soybeans from combinations of sulfur dioxide and nitrogen dioxide

1984 ◽  
Vol 62 (4) ◽  
pp. 840-846 ◽  
Author(s):  
Patricia M. Irving ◽  
Joseph E. Miller
Keyword(s):  
Sulfur Dioxide ◽  
Synergistic Effect ◽  
Nitrogen Dioxide ◽  
Air Pollutants ◽  
Interactive Effects ◽  
Premature Senescence ◽  
Glycine Max L ◽  
Seed Yields ◽  
Dose Levels ◽  
Field Plots

Gaseous air pollutants are frequently present together in the environment downwind from industrial developments and thus have the potential to cause interactive effects on biological receptors. Accordingly, an investigation was conducted to determine how combinations of the gaseous pollutants, sulfur dioxide (SO2) and nitrogen dioxide (NO2) affect a major crop. Open-air field plots of soybeans (Glycine max L.) were exposed to eight different dose levels of SO2 and NO2, alone and in combination, in the presence of ambient ozone (O3) during 1980 and 1981. The soybean plots were fumigated on 10 occasions in both years of the study during the pod-filling period for an average exposure time during fumigation of approximately 3 h. Mean concentrations during fumigation periods ranged from 0.13 to 0.42 ppm SO2 and 0.06 to 0.40 ppm NO2. Premature senescence, as measured by chlorophyll degradation, was observed in the combined pollutant plots in both years of the experiment. Fumigations with NO2 alone had no effect on seed yields in either year. Exposures with SO2 alone had no effect on yields in 1980 and decreased yields by up to 6% in 1981, possibly as a result of greater concentration peaks. Combinations of SO2 and NO2 had a synergistic effect in both years of the study and resulted in yield decreases ranging from 9 to 25%, depending on pollutant dose.

scholarly journals Health Endpoint Attributed to Sulfur Dioxide Air Pollutants

2015 ◽  
Vol 7 (3) ◽  
Author(s):  
Sahar Geravandi ◽  
Gholamreza Goudarzi ◽  
Ali Akbar Babaei ◽  
Afshin Takdastan ◽  
Mohammad Javad Mohammadi ◽  
...  
Keyword(s):  
Sulfur Dioxide ◽  
Air Pollutants ◽  
Health Endpoint
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