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 |