The Environment and Water Resources Ministry is proposing a new law that would hold liable companies or other entities that cause transboundary haze, and is seeking public feedback.

Under the proposed Transboundary Haze Pollution Bill, parties whose activities outside Singapore cause unhealthy levels of haze that affect the island-state, can be fined up to $300,000. If they deliberately ignore requests to prevent or control haze, they can be fined up to $450,000.

And under the bill, those affected by the haze can also bring civil suits against errant parties.

Singapore suffered its worst ever bout of haze in June 2013, when the three-hour PSI, a measure of air quality, hit an all-time high of 401 at one point, way beyond the "hazardous" level of above 300.

To view and give feedback on the draft Bill, visit www.reach.gov.sg. The consultation exercise will end on March 19.