NYC-WTC_000187461

NYC 9/11 Public Portal Document

o Chambers St./West St. (Site 2) - 24-hour average concentration for this period was 14.18 ug/m^. o Coast Guard Building - Battery Park (Site 3) - 24-hour average concentration for this period was 9.8 ug/m\

o Canal Street Post Office (Site 4) - 24-hour average concentration for this period was 10.2 ug/m^. o P.S. 274 - 800 Bushwick Avenue, Brooklyn (Site 7) - 24-hour average concentration for this period was 7.74 ug/m^. o All readings below the National Ambient Air Quality Standard for PM,„ (150 ug/mQ.

NYC / ER (Dec 16) - Particulate Monitoring (PM,,, filter) o Park Row (Site 1) - 24-hour average concentration for this period was 13.23 ug/nt\ o Chambers St./West St. (Site 2) - No data reported. o Coast Guard Building - Battery Park (Site 3) - 24-hour average concentration for this period was 14.6 ug/m^. o Canal Street Post Office (Site 4) - 24-hour average concentration for this period was 12.2 ug/m’. o P.S. 274 - 800 Bushwick Avenue, Brooklyn (Site 7) - 24-hour average concentration for this period was 11.73 ug/m^. o All readings below the National Ambient Air Quality Standard for PM,o (150 ug/mQ.

NYC / ER (Dec 17) - Particulate Monitoring (PMk, filter) o Park Row (Site 1) - 24-hour average concentration for this period was 24.58 ug/n^. o Chambers St./West St. (Site 2) - 24-hour average concentration for this period was 27.54 ug/m^. o Coast Guard Building - Battery Park (Site 3) - 24-hour average concentration for this period was 25.9 ug/m\ o Canal Street Post Office (Site 4) - 24-hour average concentration for this period was 25.5 ug/m^. o P.S. 274 - 800 Bushwick Avenue. Brooklyn (Site 7) - 24-hour average concentration for this period was 20.34 ug/m^. o All readings below the National Ambient Air Quality Standard for PM,o (150 ug/mQ.

NYC / ER (Jan 11) - Particulate Monitoring (Dataram)

o Monitoring of particulate levels at three locations (Stations L, N, R) was not conducted due to the weather conditions.

NYC / ER (Jan 11) - Volatile Organics (Mobile Laboratory) o Benzene did not exceed OSHA TWA PEL (1 ppm) at any of the four locations monitored, including in the debris area at ground level. o Benzene was not detected above the detection limit (20 ppbv) in 3 of the 4 locations monitored (Washing Tent, Austin Tobin Plaza, and South Tower), including in the debris area at ground level.

NYC / ER (Jan 13) - Volatile Organics (Mobile Laboratory)

CITY_21MC100_002417050

NYC-WTC_000187468