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Abstract of July 2004 Atmospheric Environment article, "A Review of Surface Ozone Background Levels and Trends":

http://www.sciencedirect.com/science?_ob=ArticleURL&_udi=B6VH3-4CDR80K-3&_user=10&_coverDate=07%2F31%2F2004&_rdoc=8&_fmt=summary&_orig=browse&_srch=doc-info(%23toc%236055%232004%23999619978%23502357%23FLA%23display%23Volume)&_cdi=6055&_sort=d&_docanchor=&_ct=20&_acct=C000050221&_version=1&_urlVersion=0&_userid=10&md5=d910aa591c9c625def4dc0c61fc97036

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