Series R   MONTHLY AVERAGES OF HOURLY READINGS OF OZONE IN DOWNTOWN
            LOS ANGELES
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         Jan.  Feb.  Mar.  Apr.  May   June  July  Aug.  Sept. Oct.  Nov.  Dec.
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  1955   2.63  1.94  3.38  4.92  6.29  5.58  5.50  4.71  6.04  7.13  7.79  3.83
  1956   3.83  4.25  5.29  3.75  4.67  5.42  6.04  5.71  8.13  4.88  5.42  5.50
  1957   3.00  3.42  4.50  4.25  4.00  5.33  5.79  6.58  7.29  5.04  5.04  4.48
  1958   3.33  2.88  2.50  3.83  4.17  4.42  4.25  4.08  4.88  4.54  4.25  4.21
  1959   2.75  2.42  4.50  5.21  4.00  7.54  7.38  5.96  5.08  5.46  4.79  2.67
  1960   1.71  1.92  3.38  3.98  4.63  4.88  5.17  4.83  5.29  3.71  2.46  2.17
  1961   2.15  2.44  2.54  3.25  2.81  4.21  4.13  4.17  3.75  3.83  2.42  2.17
  1962   2.33  2.00  2.13  4.46  3.17  3.25  4.08  5.42  4.50  4.88  2.83  2.75
  1963   1.63  3.04  2.58  2.92  3.29  3.71  4.88  4.63  4.83  3.42  2.38  2.33
  1964   1.50  2.25  2.63  2.96  3.46  4.33  5.42  4.79  4.38  4.54  2.04  1.33
  1965   2.04  2.81  2.67  4.08  3.90  3.96  4.50  5.58  4.52  5.88  3.67  1.79
  1966   1.71  1.92  3.58  4.40  3.79  5.52  5.50  5.00  5.48  4.81  2.42  1.46
  1967   1.71  2.46  2.42  1.79  3.63  3.54  4.88  4.96  3.63  5.46  3.08  1.75
  1968   2.13  2.58  2.75  3.15  3.46  3.33  4.67  4.13  4.73  3.42  3.08  1.79
  1969   1.96  1.63  2.75  3.06  4.31  3.31  3.71  5.25  3.67  3.10  2.25  2.29
  1970   1.25  2.25  2.67  3.23  3.58  3.04  3.75  4.54  4.46  2.83  1.63  1.17
  1971   1.79  1.92  2.25  2.96  2.38  3.38  3.38  3.21  2.58  2.42  1.58  1.21
  1972   1.42  1.96  3.04  2.92  3.58  3.33  4.04  3.92  3.08  2.00  1.58  1.21
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  216 observations; values are in pphm.