| Characteristic | Number of smog days |
|---|---|
| - | - |
| - | - |
| - | - |
| - | - |
| - | - |
| - | - |
| - | - |
| - | - |
| - | - |
| - | - |
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Source
Release date
January 2020
Region
United States
Survey time period
2018
Supplementary notes
* Number of days when half or more monitoring locations reported elevated ozone and/or particulate matter (PM2.5).
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