unhealthful day

Any day in which the air quality for any of the 5 major ambient air pollutants—carbon monoxide, nitrogen dioxide, ozone, particulate matter, sulphur dioxide—exceeds an established air quality standard
Segen's Medical Dictionary. © 2012 Farlex, Inc. All rights reserved.

unhealthful day

Public health Any day in which the air quality for any of the 5 ambient air pollutants–carbon monoxide, nitrogen dioxide, ozone, particulate matter, sulfur dioxide exceeds an established air quality standard. See Pollution Standards Index. Cf Unhealthy day.
McGraw-Hill Concise Dictionary of Modern Medicine. © 2002 by The McGraw-Hill Companies, Inc.
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Health-related air quality was described in terms of the number of good days, moderate days, unhealthful days, very unhealthful days, and hazardous days.