This webpage shows the 72-hour trajectory of the forecast movement of the air reaching Hong Kong at a height of 100 metres above ground level ending at 8 a.m. or 8 p.m. of the next 2 to 3 days.

The product may be useful for tracing the origin of air reaching Hong Kong.

Points to note:

• Normally, this web page will be updated daily at around 2 a.m. and 2 p.m.
• The trajectory was prepared using the This link will open in a new windowHYSPLIT model of NOAA. Anyone wishing to quote or further disseminate the data should read the This link will open in a new window"Disclaimer" of the NOAA Air Resources Laboratory web site for details.

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