meteorological regime. Therefore, for example, if there are three

meteorological regimes, at least 1 primary episode day from each

regime should be modeled; if there are only two meteorological

regimes, at least 2 primary episode days should be modeled from one

of the regimes and at least 1 primary episode day modeled from the

other regime. Note that the episodes simulated would generally be

at least 48 hours long (i.e., the first day would be an initial

modeling day and the second day would be the primary episode day).

This would count as simulation of 1 primary episode day.

To demonstrate attainment of the ozone NAAQS, there should be

no predicted daily maximum ozone concentrations greater than

0.12 ppm anywhere in the modeling domain for each primary episode

day modeled. Alternative methods for demonstrating attainment must

be approved by the appropriate EPA Regional Office on a case-bycase

basis.

The attainment test described in the preceding paragraph is

consistent with the flexibility allowed in the choice of episode

days (see Section 3.1) and reflects concerns over the difficulty of

accurately estimating emissions inputs to the model.

Recommendations

To demonstrate attainment of the ozone NAAQS, there should be

no predicted daily maximum ozone concentrations greater than

0.12 ppm anywhere in the modeling domain for each primary

episode day modeled. At least 3 primary episode days should

be modeled.

States may opt to conduct more comprehensive statistical

testing of the modeling results for the attainment demonstration.

Any alternative methods for attainment demonstration

must be approved by the appropriate EPA Regional Office on a

case-by-case basis. Any optional methods should be agreed

upon during the development of the Modeling Protocol.

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castellano: DISPER CUSTIC DESCAR RADIA italiano:

castellano: DIS CUS DES RAD english: DIS CUS DES RAD

português: DIS CUS DES RAD italiano: DIS CUS DES RAD