Tuesday should start off in the upper range of Unhealthy for Sensitive Groups or the lower range of Unhealthy . There should be some accumulation of PM2.5 pollution in the pre-dawn hours, but look for that accumulation to lessen somewhat in the morning and early afternoon. The late afternoon and evening should see the levels increasing again, but not very quickly. Overall, levels throughout the day should remain Unhealthy for Sensitive Groups or Unhealthy , but there is a slight chance of brief episodes of Very Unhealthy levels pre-dawn and of Moderate levels late morning to early afternoon.
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