NYC-WTC_000196915

NYC 9/11 Public Portal Document

Mr. Bernard P. Orlan March 18, 2002 Respirable Particulate Monitoring Page 2 Various Locations/Manhattan ATC Project No. 15-19125-0314

TARGET GUIDELINES FOR AIR QUALITY PARAMETERS EVALUATED*

KO 65 micrograms per cubic Respirable meter of air (pg/m3) 24 USEPA NPAAQS Particulates hour average (PM2.5) USEPA recommendation for children/sensitive 40 (^g/m3 24 hour average individuals USEPA = United States Environmental Protection Agency NPAAQS = National Primary Ambient-Air Quality Standard

REAL-TIME SAMPLING RESULTS

Thirty-two (32) indoor and thirty-five (35) outdoor respirable particulates measurements* were collected from thirty school locations in Manhattan, ranging from West 11* Street to East Street. The measurements were made from 5:40 A.M. to 4:45 P.M. The lAQ field report forms are provided as the Attachment.

The outdoor PM2.S concentrations ranged from 101 pg/m3 to 160 pg/m3. The indoor concentrations ranged from 36 pg/m3 to 121 pg/m3. All thirty-five (35) of the outdoor and twenty-one (21) of tlie indoor readings were above the NPAAQS of 65 pg/m3. Thirty (30) of the indoor and thirty-five (35) of the outdoor measurements were above the EPA recommended guideline for children and sensitive individuals of 40 pg/m3.

★ These measurements were instantaneous readings, the NPAAQS and the recommendation for children are 24-hour averages.

CONCLUSION

Based on our measurements,all thirty-five (35) of the outdoor and twenty-one (21) of the indoor readings were above the NPAAQS of 65 Mg/m3. Thirty (30) of the indoor and thirty-five (35) of the outdoor measurements were above the EPA recommended guideline for children and sensitive individuals of 40 pg/m3.

It is our pleasure to provide these air quality consultative services to the New York City Board of Education. If you have any questions about this report, please cedi (212) 353-8280, extension 212 or 211.

Sincerely, ATC ASSOCIATES INC. Reviewed by:

James R. Cohn, CIH, CSP Project Manager Regional Manager, Industrial Hygiene Division

Attachment

CITY_21MC100_003043913

NYC-WTC_000196916