| Atmospheric Concentrations | URBAN/SUBURBAN: 2-Butene was detected, but not quantified, in the air of Elizabeth and Pine Barrens, NJ, 1979(1). The concentration of 2-butene taken from the top of an 82 story building at noon in New York City, 1977, ranged from 5.0-6.7 ug/cu m(2). The average concentration of 2-butene and isobutene, measured in 780 samples from Houston, TX, Summer 1977, was 4 ppb(3). The concentration of 2-butene in downtown Houston obtained during two separate day-long sampling expeditions in July of 1973 ranged from not detected to 0.012 ppm and from not detected to 0.02 ppm in three sampling expeditions in Pasadena, TX(4). The concentration of 2-butene in two rooftop samples taken in Riverside, CA, 1965-66 was 10.5 and 2.0 ppb, respectively(5). 2-Butene was qualitatively identified in roadway air samples(6). 2-Butene, as a mixture with 1,3-butadiene, was determined in the air of Jones State Forest, TX, in 1978(7).URBAN/SUBURBAN: The estimated annual mean concentration of 2-butene in London, England is 3 ug/cu m(1). The observed background level of 2-butene in Sidney, Australia, was 5.1 ug/cu m(1). The mean concentration of 2-butene in urban, rural, and polluted rural locations in NW England, 1983, was 27.6, <2.1 and 5.6 ppb, respectively(2). The average concentration of 2-butene in Sidney, Australia, 1979-1980, was 2.1 ppb(3).URBAN/SUBURBAN: 2-Butene was reported in urban air in Porto Alegre, Brazil in 1996 at a mean concentration of 2.3 and 3.2 mg/cu m(1). 2-Butene was detected in 1993 at an avg concentration of 0.75 ug/cu m (not detected-3.0 ug/cu m) in Los Angeles, CA(2). 2-Butene was detected in 53% of the air samples obtained in Atlanta, GA at concentrations of 0.1-0.15 ppb(3). Mean concentrations of 3-13.9 ppb 2-butene were reported for various sites around Vienna, Austria(4).RURAL/REMOTE: 2-Butene was detected in the atmosphere of the Borden Forest, Canada in 1993 at concentrations of 0.02-0.1 ppb during daytime hours and 0.01-0.09 ppb during nighttime hours(1). 2-Butene was detected in Egbert, Canada at a concentration of 0.166-0.038 ppb(2). 2-Butene (trans) was detected in the Kejimkujik National Park, Nova Scotia (not detected-0.05 ppb), Lac la Flamme, Canada (not detected-0.03 ppb), Egbert, Canada (not detected-0.02 ppb) and Saturna Island, Canada (not detected-0.03 ppb)(3). 2-Butene was qualitatively detected in the Eggegebirge Forest, West Germany, 1988(4).SOURCE DOMINATED: 2-Butene was reported at average concentrations of 0.334-0.408 ppb along roadsides and at 0.149-0.159 ppb at airports in Atlanta, GA(1). The concentration of 2-butene at an unspecified street in London, England was reported as 7.1-9 ppb(2). 2-Butene was reported in the Caldecott Tunnel, CA at mean concentration of 6.6-11.2 mg/l in August of 1994 when low oxygenated fuels (0.3%) were being employed in the San Francisco area(3). 2-Butene was reported in the Caldecott Tunnel, CA at a mean concentration of 13.6-15 mg/l in October of 1994 when high oxygenated fuels (2%) were being employed in the San Francisco area(3). At 16 locations during the summer, monsoon, and winter season 2004 in the Thane Belapur Industrial Area in Mumbai, 2-butene was identified but not quantified, as a volatile component in source air samples collected in the vicinity of processing units and storage plants of industrial units in the sampling area(4).URBAN/SUBURBAN: cis-2-Butene was reported in urban air in Porto Alegre, Brazil in 1996 at a mean concentration of 2.3 mg/cu m(1). cis-2-Butene was reported in 1993 at an average concentration of 0.75 ug/cu m (0.0-3.0 ug/cu m) in Los Angeles, CA(2). cis-2-Butene was detected in 51% of the air samples obtained in Atlanta, GA at concentrations of 0.1-0.15 ppb(3). Mean concentrations of 3-4 ppb cis-2-butene were reported for various sites around Vienna, Austria(4). cis-2-Butene was detected at estimated concentrations ranging from 0.0-1.6 ppbv (average = 0.4 ppbv) in air samples colleted over a 1-hour period in Taipei, Twain on January 29, 1997(5). |
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