Air Quality Section
Air Quality Management in Manitoba
Winnipeg generally enjoys excellent air quality compared to other
cities of similar size in Canada. Air quality concerns in Manitoba
usually tend to be of a localized nature, where an activity has an
impact only on local people and their environment. Some of these
impacts may include the presence of odours, noise and other air
pollutants. The sources for these and other airborne pollutants
include industrial operations, vehicle emissions, man-made
substances released to the atmosphere and other specific
activities.
This information bulletin focuses on various issues the
Province of Manitoba is presently concerned with, such as: vehicle
emissions, ground level ozone (smog), stratospheric ozone (the
ozone layer), global warming and acid rain. Each section
identifies the problem area, discusses the nature of the problem
and highlights actions that have been taken or are planned by the
Province.
Vehicle Emissions
Automobiles are a major contributor to air pollution.
Pollutants such as carbon monoxide, nitrogen oxides and volatile
hydrocarbons come from vehicle exhaust. Keeping vehicle pollution
prevention devices in proper working order helps reduce vehicle
emissions. In addition, a well-maintained vehicle operates more
efficiently and costs less to run.
Many provinces have legislation making it illegal to tamper
with vehicle pollution control devices. Manitoba does not have
such requirements, as yet. However, the Province will be
participating with other provinces and the federal government soon
to ensure that Manitoban's approach to vehicle emission standards
will be consistent with other jurisdictions.
In the mid-1990s, the federal government plans to further
restrict vehicle emissions dealing with nitrogen compounds (NOx)
and volatile organic compounds (VOC). Canada's goal
is to follow the same standards and timetable as in the U.S.,
resulting in emission reductions at the earliest possible date.
Ground Level Ozone (Smog)
Smog (consisting mostly of ground level ozone) is a product of
sunlight reacting with a mixture of compounds (NOx and VOC)
producing a 'haze' effect. Smog is caused mainly by automobile
emissions and it is the greatest source of airborne pollutants in
many cities today. Ozone, at the ground level (smog) is harmful to
the environment since it can affect human health, damage certain
vegetation and degrade materials.
Smog is rarely seen in Winnipeg because the city is windy and
prolonged temperature inversions are not common. The local flat
terrain enables the compounds to be mixed and diluted, unlike
valleys and mountains which restrict such dispersion.
Stratospheric Ozone (The Ozone Layer)
Ozone in the upper atmosphere is beneficial since it filters
unwanted ultraviolet radiation from the sun which can affect human
health, as well as damage certain vegetation and aquatic life.
CFCs (chlorofluorocarbons) are just one of the many man-made
ozone depleting substances causing the destruction of the
'ozone layer' (located 15 to 40 kilometers above the earth). CFCs
are a man-made substance used for air conditioning, refrigeration
and a wide variety of other manufacturing processes. Although
emissions of CFCs will eventually be reduced through legislative
measures, the impact of these man-made substances on the ozone
layer will continue for many years because of the longevity of
these gases in the atmosphere.
Manitoba is the leader in ozone depletion legislation in
Canada. As of July 1, 1992 only certified technicians may charge,
recharge, service and repair refrigeration and air conditioning
units in Manitoba (5,000 certified technicians have been trained,
to date, in the province). Having only certified trained service
technicians work on various systems ensures the recovery of ozone
depleting substances for reuse, recycling, reclamation or recovery
for destruction.
Global Warming
The earth's climate is far from stable. Climatic changes have
resulted from an interplay of natural forces: variation in the
sun's energy output, volcanic eruptions and an ever changing
atmosphere being modified by evolving life forms. The earth's heat
balance is currently being affected by the man-made addition of
greenhouse gases such as carbon dioxide, methane, nitrous oxide
and CFCs. The result is global warming due to an enhanced
"greenhouse effect".
The "greenhouse effect" occurs naturally, warming the
earth and making habitation possible. Global warming occurs when
this natural process has been altered by human activities over the
years.
Canada has established a goal of reducing greenhouse gas
emissions by the year 2000 to similar levels as in 1990. Less than
3% of Canada's carbon dioxide emissions are generated in Manitoba;
the use of fossil fuels for transportation accounts for most of
these emissions. Manitoba has recently completed a comprehensive
inventory of the sources of greenhouse gases in the Province for
1990. Additionally, Manitoba is cooperating with other
jurisdictions to seek ways and means of meeting the national
emissions goal.
Acid Rain
The primary pollutants in the formation of acid rain are
sulphur dioxide and nitrogen oxides. They combine with moisture in
the atmosphere to produce sulphuric acid and nitric acid. Sulphur
dioxide is emitted from such installations as the two smelters in
northern Manitoba (Flin Flon and Thompson). Nitrogen oxides are
generated from such sources as automobile emissions and all other
kinds of fossil fuel combustion or burning of fossil fuels.
Acid rain is not a problem in Manitoba since acidity of
precipitation is not generally elevated and since much of the
soils and surface waters have a buffering capacity to neutralize
such deposition. However, as part of a program to reduce acid rain
in Eastern Canada, Manitoba is working towards reducing its
sulphur dioxide emissions. This will assist in an overall national
program and ensure a continued healthy environment for Manitobans.
Summary
We must be responsible towards our environment to preserve it
for present and future generations. Pollution prevention measures
will help to ensure the health and well-being of future
generations. Manitoba is committed towards ensuring that our good
air quality will be maintained and protected.
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Additional information about Air Quality in Manitoba can be
obtained from:
» Manitoba Conservation Air
Quality Section, (204) 945-7100
» Conservation &
Environment Library On-line
Database
Manitoba Conservation Air Quality Section © 2002
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