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.