The two southerly regions are the subject of a
vii) A more comprehensive overview of the current
greater number of MOE smog alerts, while the
prevailing situation would require a joint co-
northern locale has a higher annual average ozone
ordinated effort by the federal, state and provincial
concentration. Continued non conformance with the
Ontario interim 24 hour PM10 objective and the
annual Total Suspended Particulate ambient air
quality criterion (AAQC) is evident in Sault Ste Marie
Ontario, particularly at the monitoring site adjacent
to the Algoma Steel facility. Concentrations of
Senior levels of the USEPA and Environment
benzo-a-pyrene at this industrial site were also in
Canada should join with their counterparts in the
excess of the provincial AAQC for this contaminant.
State of Michigan and the Province of Ontario to
provide a more comprehensive, current and joint
ii) Sources of smog are both regional (Chicago-Quebec
overview of air quality in these three regions.
City corridor) and local (mobile, point and areal
Sharing of the most current information regarding
sources). Improvement in local and downwind air
routine sampling and monitoring results should be a
quality, particularly in the two southern locales,
part of this co-operative effort.
would require significant reductions from all local
source segments, including gasoline and diesel
This same body should also commit to the develop-
powered vehicles in the mobile sector.
ment of an appropriate bilateral control strategy,
considering both stationary and mobile sources of
iv) With regard to hazardous air pollutants (HAPs), of
common air pollutants and HAPs, to achieve
those tracked by the Commission in 1991, there is
significant reductions in local and regional concen-
evidence that emissions of several of these may have
trations of those pollutants adversely affecting
declined over the ensuing period. However, emis-
regional air quality.
sions of trichloroethylene and xylene compounds
appear to be at or above previous estimates. Many
ii) The Commission should adopt the role of facilitat-
organic HAPs are Volatile Organic Compounds
ing discussion and communication among the
(VOCs) and, as such, also contribute to the forma-
Parties and Jurisdictions in supporting the develop-
tion of ozone. There is some evidence of particular
ment of integrated monitoring programs and
HAPs in excess of the levels associated with the
control strategies in these regions.
one-in-one-million lifetime cancer risk benchmark in
the US Clean Air Act.
iv) Continued development of a mechanism to com-
pare air quality standards and guidelines for both
Concentrations of hazardous air pollutants are more
common and hazardous air pollutants in
strongly associated with local sources and further
transboundary airsheds is also recommended.
regional reductions from both mobile and stationary
sources would be required to lower these concentra-
The IJC should carefully track the US Urban HAPs
Study currently underway in ten cities in the United
States and assess the outcomes of this study, as
vi) Additional assessment of the health impact of these
these would have relevance could be applied in the
HAPs individually is complicated by the differences
three regions, particularly the two southern locales,
among the various guidelines and standards prevail-
as well as a vast majority of North American urban
ing among the jurisdictions; however, the risk
assessment now underway under the US Ten City
Study may offer some further guidance on this issue.