Despite massive reductions in the emission of major air pollutants by power plants, roadside pollution has worsened as vehicles and ships crank out more nitrogen oxides and sulphur dioxide than they ever have before.
One of the main culprits is the huge numbers of old, diesel-powered trucks that are still being used in our city.
These trucks fit the Euro II emission standards that were introduced more than a decade ago, and they give off much more pollutants than their costlier, cleaner substitute models.
The reason that so many of these outdated trucks are still around is that their owners can't afford to get a new one.
Truck drivers aren't exactly in the upper strata, and the rising cost of living means that they have even less disposable income.
Whether or not their vehicles produce harmful pollutants that damage living standards for Hong Kong citizens is the least of their concerns.