Adverse meteorological conditions, such as strong wind, heavy rain and thunder, would affect the noise measurements. For the existing Ching Lam noise monitoring station, the computer has been programmed to automatically discard the noise data when the instantaneous wind speed measured at the station building rooftop exceeded 10 m/s. In case when there is a thunder or heavily raining, winds may not be strong enough to inhibit data, then noisy thunder and rain would have to be manually correlated with the alarm/events. If a noise alarm were raised, the operations staff on duty round the clock would record the event. The relevant data would then be manually discarded.

Date	Weather Condition
a. Ash Lagoon
01/11/2000	Fine
02/11/2000	Fine
03/11/2000	Fine
04/11/2000	Cloudy
05/11/2000	Fine
06/11/2000	Cloudy
07/11/2000	Cloudy
b. Pak Kok Tsui
24/11/2000	Fine
25/11/2000	Fine
26/11/2000	Cloudy
27/11/2000	Fine
28/11/2000	Fine
29/11/2000	Fine
30/11/2000	Fine