Name: NH maximum ozone Units: DU Month: April Source: toms+omi+omps Missing: -9999.0 Year Data Minumum Maximum 1979 555.56 510.00 638.00 1980 551.87 531.00 568.00 1981 535.57 502.00 569.00 1982 559.60 544.00 580.00 1983 515.03 494.00 540.00 1984 536.30 513.00 562.00 1985 572.50 536.00 595.00 1986 525.13 488.00 566.00 1987 535.50 507.00 567.00 1988 560.73 534.00 583.00 1989 546.40 498.00 576.00 1990 503.27 462.00 533.00 1991 551.63 528.00 570.00 1992 503.03 470.00 529.00 1993 452.17 434.00 476.00 1994 528.72 487.00 606.00 1995 -9999.00 -9999.00 -9999.00 1996 -9999.00 -9999.00 -9999.00 1997 492.43 471.00 525.00 1998 522.17 487.00 576.00 1999 536.13 510.00 567.00 2000 478.87 458.00 517.00 2001 523.43 508.00 554.00 2002 511.77 492.00 529.00 2003 516.80 495.00 557.00 2004 534.03 497.00 561.00 2005 499.70 451.00 541.00 2006 521.57 507.00 534.00 2007 488.50 469.00 516.00 2008 496.23 459.00 527.00 2009 507.67 485.00 541.00 2010 525.43 492.00 564.00 2011 500.50 466.00 555.00 2012 510.83 472.00 537.00 2013 515.77 478.00 551.00 2014 507.63 474.00 559.00 2015 545.34 495.00 588.00 2016 486.03 452.00 525.00 2017 505.63 476.00 542.00 2018 521.73 497.00 565.00 2019 541.90 509.00 569.00 2020 477.53 448.00 522.00 2021 508.47 478.00 554.00 2022 492.17 461.00 520.00 2023 512.30 478.00 543.00