>150-250 >355-425 Very Unhealthy People with respiratory or
heart disease, the elderly and
children, should avoid any
Everyone may experience outdoor activity; everyone else
should avoid prolonged
more serious health effects.
exertion.
>250 >425 Hazardous Everyone should avoid any
outdoor exertion; people with
respiratory or heart disease,
The entire population is more the elderly and children,
should remain indoors.
likely to be affected.
* Developed from EPA’s Air Quality Index: A Guide to Air Quality and Your Health, EPA-454/R-00-005, June 2000 and EPA
Guideline for Reporting of Daily Air Quality - Air Quality Index (AQI), EPA-454/R-99-010, July 1999 (at:
http://www.epa.gov/airnow/publicatians.html).
** I hese comparison levels are guidelines to make public health decisions. Detected concentrations of PM above specific guideline
levels does not mean that adverse health effects will occur.
Page 31 of
NYC-WTC_000153204
OCR can misread numbers and units. Confirm readings against the page image before using them.
NYC-WTC_000153204Source: NYC Law Department, mirrored locally
Document displaying the New York State Department of Environmental Conservation air quality index and pollutant level thresholds for general health effects.