Urban Vegetation Air Quality Information Program

This page last reviewed May 15, 2003

Urban vegetation plays an important part in the quality of life. The obvious roles are pleasant aesthetics, shading, photosynthesis, absorbing gaseous pollutants, wind speed reduction, and property value appreciation, while the less obvious ones include evapotranspiration, intercepting and storing rainfall, absorbing high frequency noise, and many more. However, not all vegetation processes the same level of benefits. Some vegetation emits gases and particles that can adversely impact air quality. Vegetation chosen carefully and correctly for urban planting can measurably reduce air quality impacts.

The objective of a Urban Vegetation Air Quality Information Program is to provide consumers with additional information that air quality is another factor that should be considered when purchasing vegetation. Urban vegetation is defined as plants or trees in parks, yards, public spaces, along streets, in commercial and residential areas.

This page contains related information that facilitates the development of this program.

Program Elements:

  • The program targets at vegetation suppliers but is voluntary.
  • The program applies to urban areas.
  • Provide information on hydrocarbon and allergen's emissions from vegetation.
  • Public outreach to inform on tree selection.


  • Public consultation workshop on June 3, 2002
  • Advisory work group formation by June 2002
  • Concept development throughout June, July, and August 2002
  • Public workshops in October 2002
  • Board hearing on the program concept by end of 2002

Other Documents and Related Materials:

  • TBA