<Tr> <Th> Mean monthly sunshine hours </Th> <Td> 160.3 </Td> <Td> 163.3 </Td> <Td> 189.0 </Td> <Td> 205.0 </Td> <Td> 213.0 </Td> <Td> 182.0 </Td> <Td> 120.0 </Td> <Td> 152.5 </Td> <Td> 176.2 </Td> <Td> 198.8 </Td> <Td> 153.2 </Td> <Td> 152.6 </Td> <Td> 2,066 </Td> </Tr> <Tr> <Th> Percent possible sunshine </Th> <Td> 52.3 </Td> <Td> 53.6 </Td> <Td> 51.0 </Td> <Td> 51.9 </Td> <Td> 48.4 </Td> <Td> 41.2 </Td> <Td> 26.8 </Td> <Td> 36.2 </Td> <Td> 47.2 </Td> <Td> 57.1 </Td> <Td> 50.2 </Td> <Td> 51.1 </Td> <Td> 46.4 </Td> </Tr> <Tr> <Td_colspan="14"> Source: Korea Meteorological Administration (percent sunshine and snowy days) </Td> </Tr> <P> Air pollution is a major issue in Seoul . According to the 2016 World Health Organization Global Urban Ambient Air Pollution Database, the annual average PM2. 5 concentration in 2014 was 24 μg / m, which is 2.4 times higher than that recommended by the WHO Air Quality Guidelines for the annual mean PM2. 5 . The Seoul Metropolitan Government monitors and publicly shares real - time air quality data . </P>

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