University Park, Pa. --- Penn State researchers have identified how ozone, a major smog constituent, affects the microscopic breathing pores on plants' leaves, a process that may figure in the estimated $3 billion in agricultural losses caused by ozone air pollution in the U.S. each year.
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Penn State. "Explaining How Ozone "Chokes Up" Plants." ScienceDaily. ScienceDaily, 7 December 1999. <www.sciencedaily.com/releases/1999/12/991207072741.htm>.
Penn State. (1999, December 7). Explaining How Ozone "Chokes Up" Plants. ScienceDaily. Retrieved March 7, 2014 from www.sciencedaily.com/releases/1999/12/991207072741.htm
Penn State. "Explaining How Ozone "Chokes Up" Plants." ScienceDaily. www.sciencedaily.com/releases/1999/12/991207072741.htm (accessed March 7, 2014).