THE NSW government will spend $8.5 million retrofitting exhaust filters on trucks that regularly use the M5 tunnel, despite tests showing pollution in it does not exceed standards.
Roads Minister Duncan Gay says a trial air filtration plant in the tunnel will be shut down because it "only (had) a minor impact on air quality and its ongoing operation is not value for money."
"The study indicated around five per cent of total haze pollution and three per cent of nitrogen dioxide in the tunnel was being removed via the filtration plant," he said on Wednesday.
Air quality in the heavily-used tunnel had been monitored 24 hours a day and pollution doesn't exceed World Health Organisation standards, Mr Gay said.
While the government sees no need to persist with the air filters, Mr Gay said it's necessary "to focus on cleaner vehicles, primarily heavy vehicles, to promote fewer emissions and cause less pollution," despite tests showing pollution was not at unacceptable levels.
It will use the $8.5 million to subsidise half the cost to assess, repair and fit trucks with particle traps.
"Smoky vehicle cameras inside tunnel ... will use number plate recognition to identify and target the smokiest heavy vehicles, with the owners contacted and offered the retrofit program," Mr Gay said.
The cameras caught 300 trucks with excessive levels of emissions in the past year - an offence for which owners could be fined $2000.
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