There is no doubt we have a problem with the air we breathe. Hong Kong's dirty air is costing the territory billions of dollars and driving away professional talent. The government has vowed to tackle roadside pollution by phasing out the most polluting vehicles. But maritime pollution is an even bigger culprit when it comes to some of the major pollutants in the air. As Varsity learns, even shipowners are urging the administration to take tougher action.