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You are here: Home / Publications / Periodicals / Natural Outlook / Natural Outlook, 2014 / Benzene Exceedances at Port Arthur, 1997–2012, and Styrene Exceedances at Lynchburg Ferry, 2003–2013.

Benzene Exceedances at Port Arthur, 1997–2012, and Styrene Exceedances at Lynchburg Ferry, 2003–2013.

Chart data in text format (Natural Outlook, July 2014)

Decline in Benzene Exceedances at Port Arthur, 1997–2012.

This graph shows the overall decline in annual average benzene concentrations at the TCEQ’s City Service Center monitor. The annual averages for each year are: 1.64 ppb for 1997, 1.37 ppb for 1998, 1.78 ppb for 1999, 1.53 ppb for 2000, 1.48 ppb for 2001, 1.11 ppb for 2002, 1.25 ppb for 2003, 1.32 ppb for 2004, 1.15 ppb for 2005, 0.65 ppb for 2006, 0.70 ppb for 2007, 1.93 ppb for 2008, 0.82 ppb for 2009, 0.98 ppb for 2010, 0.57 ppb for 2011, and 0.45 ppb for 2012. Year 1997 reflects incomplete data as monitoring did not begin until May. The 2008 annual average was driven in large part by two very high exceedance days, one that was likely due to a spill and the other from start-up operations after Hurricane Ike.

Decline in Styrene Exceedances at Lynchburg Ferry, 2003–2013.

This graph shows how the number of hours monitored above 25 ppbv has decreased since its peak year in 2005. The number of hours is: 23 for 2003, 57 for 2004, 92 for 2005, 52 for 2006, 42 for 2007, 32 for 2008, 20 for 2009, 27 for 2010, 3 for 2011, and 6 for 2012. Year 2003 reflects incomplete data as monitoring did not begin until April. Year 2011 also reflects incomplete data as the monitor was moved in September and did not collect data the remainder of that year.