Ten years after the territory was handed back to the Chinese, pollution is one of the biggest problems facing the former British colony as it bears the environmental consequences of China's rampant economic growth.

For around a third of last year, Hong Kong's renowned Victoria Harbour was obscured by a grimy haze, with the number of days of reduced visibility up by 172 per cent since 1997.

Even the government says smog is now "a common phenomenon" throughout the heavily industrialised Pearl River Delta region of southern China.

"Pollution is a huge problem," said Lew Young of the World Wildlife Fund, which studies water and air quality.

"Visit Lau Fau Shan and you will certainly be wary of buying oysters in Hong Kong. But it is the rubbish you can't see that's causing the real problems."

Young manages the Mai Po marshes, a haven for migratory birds in northwest Hong Kong and designated a site of special scientific interest in 1976.

Since then Shenzhen, just over the border in China, has grown from a small fishing community into a thriving port and manufacturing hub of around seven million people, with huge environmental consequences.

"A lot of buildings were put up in a hurry -- cowboy stuff -- with no connections to proper sewage plants, because it was cheaper and easier just to connect them to the storm drains. Which means the sewage just flows straight into the bay," said Young.

"The authorities are planning to build more treatment plants on the Shenzhen side, but the pace of development is such that they cannot keep up."

Agriculture adds to the problem. Farmers are supposed to have their own water treatment facilities, but pumps that consume expensive electricity are often switched off at night when inspectors are less likely to notice.

Young said the situation improved under Hong Kong's last British governor, Chris Patten, who introduced legislation including a requirement that all big projects undergo an environmental impact assessment.

"He made some changes that had a positive impact. But afterwards a lot less happened."

The oyster industry has shrunk to just a few farms, and water quality is so bad that those that remain are threatened with closure.

Bird numbers have not recovered from a rapid decline in 1996, particularly rarer species, and Young said the bird population mainly consists now of more pollution-tolerant species.

His fears are echoed by many here, where worsening air quality and recent scares over contaminated food have put pollution at the top of the political agenda.

Chief Executive Donald Tsang's solutions -- turning notoriously arctic air conditioning systems up a couple of degrees and dressing down for the office over the summer months -- have failed to impress.

"It is a total sham and a shame," said Christian Masset, chairman of the environmental pressure group Clear the Air, of the government's policies.

"Any excess electricity produced in Hong Kong is simply sold to China instead. As long as that happens, electricity savings cannot result in less pollution. It's purely cosmetic."

Masset said there was a steady improvement in Hong Kong's air quality from the late 1990s, when diesel-fuelled taxis began being phased out and new rules were introduced on diesel for goods vehicles.

But in recent years, he says, the situation has worsened dramatically, much of it due to power plants switching from natural gas to cheaper coal.

Across the border, China's rampant economic growth has resulted in a surge in demand for energy, and coal-burning plants that were once closed down for environmental reasons are reopening -- although authorities in southern China are working to replace them with newer, cleaner facilities.

Last year investment bank Merrill Lynch warned that poor air quality could prompt big companies to move to Singapore with expatriate workers unwilling to live here.

"The government in Hong Kong is relatively powerless to address the true causes until Beijing gets tough. It could be a long and choking wait that many could choose not to endure," it said.

The conductor of the Hong Kong Philharmonic has moved his young family to the United States citing concerns over pollution, while an onboard lecturer on the Queen Mary 2 cruise ship visiting the city triggered a storm by advising passengers not to go ashore.

"It is no longer necessary today, as it still was last year, to argue that air quality is a serious issue for Hong Kong," said US Consul General James B Cunningham in a speech to the Chinese Chamber of Commerce.

"A year ago people were still telling me that only expatriates in Hong Kong cared about pollution and its impact on the city's health and economic potential. I don't hear that any more."

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