Proposed Designations of Air Quality Maintenance Areas

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These levels are Indicated on Table 6a.
As for the ratio of light duty vehicles to all vehicles at either site, no firm data is available. EPA suggests that light duty vehicles generally constitute 89% of all vehicles, but in urban areas light duty vehicles represent a lower percentage of all vehicles. ^niatevGr the actual percent, the measured level of CO at the T-Jaltham station was so high that Boston is not excluded. The Springfield S'^SA is excluded if we assume light duty vehicles constit
...uted at least 73% of all vehicles* a reasonable assumption.
All other SMSAs are automatically excluded for lack of data.
E. Oxidants (Ozone) 1) Automatic Exclusion- An area is automatically excluded for oxidants if a) it has no transportation control strategy for this contam.lnant ? and b) the measured levels of this contaminant vjithin the past two years never rose as high as 0.16 ppm in any one-hour period.
Since Boston and Springfield alone among the Hassachusetts S^fSAs have transportation control strategies , they obviously do not qualify for exclusion, but all of the other ST''SAs do qualify if they meet part b) of the criterion above.


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