EPA air monitoring data summary, WTC area, Oct 2001

NYC 9/11 Public Portal Document

In the News - Headlines Page 1 of 3

»J iB \ ¥ UJ EPA Mewsroom <9

Home 1 Recent Additions | Contact Us Search: I.... ' Advanced Search

EPA Newsroom Monitoring Site: Pace University Browse EPA Topics Laws & Regulations Fine Particulate Matter (PM 2.5) Air Monitoring Data Where You Live Information Sources This table shows how much fine particulate matter (particles less than 2.5 micrometers Educational Resources in diameter) the New York State Department of Environmental Conservation has About EPA measured in the air at this site, on the dates and times shown. Programs Business Airborne particles like smoke and dust are solids and liquid droplets of different sizes Opportunities suspended in the air. EPA sets the level of concern to caution sensitive groups, Jobs 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 Recursos en Espahol 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.

Date Time Hourly Measurement* ug/m3*** 10/06/2001 12 AM

10/05/2001 Daily Average: 33.7

10/05/2001 11 PM 30.64 10/05/2001 10 PM 30.23 10/05/2001 9 PM 3A4T 10/05/2001 8 PM 204 10/05/2001 7 PM 22:99 10/05/2001 "eW 25:29 10/05/2001 5 PM TU" 10/05/2001 4 PM 2437 10/05/2001 3 PM 334T 10/05/2001 2 PM 092 10/05/2001 1 PM 28:54 10/05/2001 12 PM 35.14 10/05/2001 iTAM 48:08 10/05/2001 10 AM 5T94 10/05/2001 9 AM 4453 10/05/2001 8 AM 068 10/05/2001 7 AM 3545

http://oaspub.epa.gov/nyr/pm_monitoring ?p_addr_id=PUNIV 10/9/01

CONFIDENTIAL, CITY_21MC100_001878999 SUBJECT TO PROTECTIVE ORDER NO. 2, SEPT. 2008 NYC-WTC_000178326