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| Census Tract Type | Frequency | Percent |
|---|---|---|
| Type 1 (Routine Emissions = 0, Excess Emissions = 0) | 47,746 | 84.45% |
| Type 2 (Routine Emissions > 0, Excess Emissions = 0) | 4,880 | 8.63% |
| Type 3 (Routine Emissions > 0, Excess Emissions > 0) | 3,910 | 6.92% |
| Total | 56,536 | 100.00% |
Note: Values in Frequency column represent the number of census tract-year observations.
