The annual report from Clean Air Hamilton says air quality in the city has improved dramatically in the last 20 years but that there is still room for improvement.
The report shows that most pollutants have decreased between 30-50 per cent since the 1990′s.
The biggest improvement being seen in levels of benzene and benzo-a-pyrene which decreased 75 per cent.
The city also experienced fewer smog advisories than the year before but the same number of poor air quality days.
Clean Air Hamilton attributes better air quality to tighter U.S. regulations, better emission standards for local vehicles and the loss of major manufacturing operations in the city.
The report recommends continued efforts to monitor air quality and an updating of city bylaws aimed at deceasing particulate matter in the environment.
Clean Air Hamilton also hopes to see increased efforts in support of Hamiltonians actively trying to reduce transportation based emissions.