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Ozone level changes associated with 88 strong earthquakes of magnitudes 4.5–7.2 in Central Asia from 1973 to 1985 (solid line) [59]. A Dobson unit is the column density of O3 in Earth atmosphere equivalent to a 10 µm thick layer of O3 under standard temperature and pressure. Dotted line: average O3 values during non-perturbed days; Dashed lines: 95% confidence level.
