NYC-WTC_000204902

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Fine Particulate Matter (PM 2.5) Air Monitoring Data

This table shows how much fine particulate matter (particles less than 2.5 micrometers in diameter) the New York State Department of Environmental Conservation has measured in the air at this site, on the dates and times shown.

Airborne particles like smoke and dust are solids and liquid droplets of different sizes suspended in the air. EPA sets the level of concern to caution sensitive groups, including children, the elderly, and people with heart or lung disease. For fine

■■ particles, that level is 40 ug/m3** for 24-hour average exposure. This level is based on EPA's Air Quality Index . Above this level, we recommend that sensitive groups reduce their exposure. Shorter term peaks are also of potential concern for sensitive groups. The level of concern for the general population is 65 ug/m3** over a 24 hour period. Most healthy adults and children are expected to recover quickly from any symptoms of short-term exposure like coughing, wheezing, or eye and throat irritation. EPA expects the long-term risk from these short-term exposures to be low.

See PM Fact Sheet for more information about particulate matter and how to reduce your exposure.

Hourly Measurement* Date Time niq/m3*** ___.............. 10/14/2001 12 AM

10/13/2001 Daily Average: 23.37

10/13/2001 11 PM 16.74 10/13/2001 10 PM 17.39 .1.6/13)2091 9 PM 22.87 10/13/2001 8 PM 20.51 10/13/2001 7 PM .1.6:09 10/13/2001 GPM 162 10/13/2001 5 PM 10/13/2001 4 PM 10.46 10/132001 "3 PM 10.44 io/13/2601 "2 PM 23.33 '16/1'3/2601 '16/13/2661 2229 16/13/2661 lY/\M 10/13/2001 10 AM 32.32

1 of 4 10/19/01 11:44 AM

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NYC-WTC_000204902