Unhealthful day | definition of unhealthful day by Medical dictionary
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.
References in periodicals archive
Health-related air quality was described in terms of the number of good days, moderate days, unhealthful days
, very unhealthful days
, and hazardous days.