Table 2: Correlation coefficient (r) between ozone concentrations in Japan and industrial waste gas emissions in China from 2000 to 2009.
Pref. Number of stations ( r ) 1-hr ( r ) max. 1-hr
Hokkaido 23 0.80 0.78
Aomori 6 0.60 0.48
Akita 5 0.70 0.53
Yamagata 10 -0.67 -0.80
Niigata 28 0.98 0.96
Toyama 25 0.20 -0.19
Ishikawa 22 0.80 0.58
Fukui 22 0.89 0.70
Tottori 3 0.76 0.51
Shimane 7 -0.35 -0.66
Yamaguchi 19 0.89 0.81
Fukuoka 40 0.84 0.81
Saga 9 0.82 0.82
Nagasaki 18 0.85 0.84
Kumamoto 20 0.91 0.91
Kagoshima 9 0.83 0.76
Okinawa 4 0.08 -0.13