What triggers cloud seeding operations for haze?

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Cloud Seeding Operations Triggered by Prolonged Unhealthy Air Quality Levels

Cloud seeding operations will be initiated if the Air Pollutant Index (IPU) consistently registers within the unhealthy range of 151 to 200 for a period exceeding 24 hours. This measure is contingent upon favourable atmospheric conditions being present at the time.
Deterioration of Air Pollutant Index

The Malaysian Meteorological Department (MetMalaysia) has outlined specific criteria for implementing cloud seeding. The trigger point is a sustained period of unhealthy air quality, defined by the IPU remaining between 151 and 200. This condition must persist for more than 24 consecutive hours before cloud seeding can be considered.
Dependence on Favourable Atmospheric Conditions

Even when the IPU reaches the specified unhealthy threshold, the execution of cloud seeding operations is not guaranteed. Nik Nazmi Nik Ahmad, Minister of Natural Resources, Environment and Climate Change, has stated that the operations are subject to the availability of suitable atmospheric conditions. This implies that meteorological factors must align to allow for the effective dispersal of seeding agents and the potential inducement of rainfall.
Broader Haze Management Strategies

While cloud seeding is a potential response to deteriorating air quality, it is part of a larger strategy to manage haze. MetMalaysia also utilises prediction models to forecast cross-border haze movement for up to five days. Furthermore, the Minister noted that open burning incidents across the country are generally under control, with a significant majority of complaints related to garbage burning. The decrease in reported hotspots compared to previous years, such as 714 compared to 2,091 in 2019, also indicates a reduction in significant open burning activities. The anticipated onset of the north-east monsoon phase next month, bringing heavy rains, is expected to further alleviate the haze situation, particularly in East Coast states and West Sarawak.

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What triggers cloud seeding operations for haze?

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