Beijing Blue: Impact of the 2008 Olympic Games and 2014 APEC Summit on Air Quality.

In particular, the coefficient of t is negative and significant (p-values=3.144e-32, 0.0001, and 0.0006, respectively, for Olympic and 0.008, 0.025 and 0.023, respectively, for APEC), while the coefficient of t-squared is positive and slightly significant (p-values=0.012 and 0.053 for Olympic and 0.003 and 0.004 for APEC).

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