| Atmospheric Concentrations | URBAN/SUBURBAN: The average ethane concentration for 2 samples per 4 sites in Tulsa, OK was 19.2 ppbC with a range of 2.3 to 73.5 ppbC(1). The ethane concentrations for 6 sites in Rio Blanco, CO averaged 27.0 ppbC with a range from 4.6 to 136.1(1). Ethane was detected in 20 of 20 air samples from Houston, TX ranging in concentration from 13.8 to 751.8 ppm with an average of 124.2 ppm(2). The arithmetic and geometric means were 54.2 and 44.2 ppbC, respectively, for the atmospheric ethane content at urban locations in New England(3). The ground level atmospheric concentration of ethane at 13:25 was 79 ppb and 406 ppb at 08:00 for Huntington Park, CA(4). At 1500 ft the ethane concentration was 43 ppb at 07:43 and at 08:07 at a height of 2,200 ft the ethane concentration was 39 ppb(4). The ethane concentration ranged from 32 to 221 ppbV at a downtown Los Angeles location during the Fall of 1981(5). The ethane concentration at 1100 ft just east of Antioch, CA was 11.5 ug/cu m, at 1000 ft near Pittsburg, CA was 7.0 ug/cu m, at 1100 ft over Carquinez Strait, CA was 5.5 ug/cu m and at 1000 ft over San Pablo Bay, CA was 4.0 ug/ cu m(6). Ethane was detected in Atlanta, GA in 1992 with an average concentration of 101.1 ppb(7). The ethane concentrations were 3.5, 3.0, and 2.5 ug/cu m at 10, 15, and 40 miles downwind of Janesville, WI on August 14, 1978(8). According to the National Ambient Volatile Organic Compounds (VOCs) Database, the median urban and suburban atmospheric concentrations of ethane were 9.150 ppbV for 571 samples and 15.780 ppbV for 226 samples,respectively(9).URBAN/SUBURBAN: Ethane was detected in the atmospheres of Pretoria, Johannesburg and Durban, South Africa(1). Ethane was identified in the ambient air of Sydney, Australia(2) ranging in concentration from 0.8 to 42.4 ppbV with an average concentration of 9.4 ppbV(3). Ethane was detected at an average concentration of 124.9 ppbC in the atmosphere over the British Columbia Research Council Laboratory at the University of British Columbia(4). The average ethane concentration in the air over Tokyo, Japan in 1980 and 1981 were 2.7 and 2.4 ppb for 66 and 192 samples, respectively(5). At Deuselbach, Hunsruck in Germany, the atmospheric ethane concentration was 1.55 ppb for October 23 1983(6). The minimum, maximum and average ethane concentrations in the ambient air of Bombay, India were 1.4, 355.7 and 26.7 ppb, respectively(7). Ethane was detected in urban Australia at a concentration of 7.5 ppb(8). In 1990 ethane comprised 1.68% of UK volatile emissions based on mass(9). Ethane was detected in Tapei, Taiwan, Chicago, IL and Osaka, Japan at concentrations of 8.3, 6.4 and 24.3 ppbV, respectively(10). Ethane was detected in 100% of the urban areas tested with a mean concentration of 5.37 ppb(11). Ethane was detected in rural (Fohnau), residential (Nansen Strasse) and street (Frankfurter Alee) sites in Berlin, Germany at concentrations of 2.59, 4.87 and 7.11 ug cu m, respectively(12). Ethane was detected in Edmonton, Alberta, Canada at median concentrations 10.13 and 11.66 ug/cu m in downtown and industrial areas, respectively(13). Ethane was detected in Vienna, Austria (1988), Sydney, Australia (1982), Chicago, IL (1989) and Osaka, Japan (1993) in average concentrations of 28.3, 7.5, 6.4 and 24.3 ppbV, respectively(14).INDOOR: Ethane was detected in the air at the 6th floor of the Cooper Union Building, at street level and the 82nd floor of the Empire State Building, at the World Trade Buildings and the Interstate Sanitation Commission in New York City, NY at 6:00-9:00AM, 9:00-11:00AM and 1:00-3:00PM, in July 1978(1). Ethane was detected at an average concentration of 12.3 ug/cu m for 5 samples collected at the 82nd floor of the World Trade Center in New York City between 5:00AM - 5:30PM Aug 23, 1977(2).RURAL/REMOTE: The respective median, minimum, and maximum atmospheric concentrations of ethane for 5 rural locations in North Carolina ranged from 2.6 to 9.1, 1.1 to 7.2, and 2.6 to 13.0 ppb(1). The atmospheric concentration of ethane for Jones State Forest, TX ranged from 17.7 to 38.4 ppb with an average of 27.1 ppb for 10 samples(2). The arithmetic and geometric means were 14.9 and 6.4 ppbC, respectively, for the atmospheric ethane content at rural locations in New England(3). Forest hydrocarbon emissions near Baton Rouge, Louisiana had background ethane levels of 5-35 ppbv(4). Ethane was detected at concentration of 2.3 ppbC in Everglades Florida(5). For 9 samples collected over a 30 hour period, the average ethane concentration in the Smokey Mountains, NC was 11.4 ppbC with a range from 8.6 to 16.0 ppbC(6). On Aug 27, 1976, the average ethane concentration for air over Lake Michigan at altitudes of 2000, 2500, and 3000 ft was 7.5 ppbV(7). On Aug 28, 1976, the average ethane concentration for air over Lake Michigan at altitudes of 1000 and 1500 ft was 2.3 ppbV(7). Ethane was detected at concentrations ranging from 0.86 to 2.1 ppbv, with an average concentration of 1.27 ppbv, in ambient air samples collected from a rural site at the summit of Whiteface Mountain in New York in July 1994(8). According to the National Ambient Volatile Organic Compounds (VOCs) Database, the median rural and remote atmospheric concentrations of ethane were 3.821 ppbV for 33 samples and 2.095 ppbV for 10 samples, respectively(9).For more Atmospheric Concentrations (Complete) data for ETHANE (6 total), please visit the HSDB record page. |
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