Additionally, all reported values were below environmental standards issued by the Japanese Ministry of Environment: 0.06 ppm for NO 2 , 0.1 mg/m 3 for suspended particulate matter, 0.04 ppm for SO 2 , 10 ppm for CO, and 0.06 ppm for O 3 , and the impact of air quality may not be significant during the study period.
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Decrease of tear break-up time at Japanese eye clinics during five consecutive years.
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