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Recent PM 2.5 Events in Burlington, VT on 2/19-20/04 & 3/1/04
(by FDMS TEOM which includes Volatile PM missed by SES TEOMs)
Note:
Volatile Fine Mass of 15-25 ug/m3 on
event days
VT FDMS TEOMs have generally shown good agreement with FRM Mass (but not on 3/1/04 FRM day, when TEOM > FRM by about 10 ug/m3).
One possible interpretation could be loss of volatile Nitrate form FRM filters.
Burlington, VT AQI > 100 was New England Max on 2/19 (& 3/1), although similar (& even higher) PM 2.5 was reported in Southern Quebec.
At L’Acadie, Quebec (SE of Montreal), collocated BAM and 30 deg SES TEOM showed BAM > TEOM by 15-30 ug/m2 (data from Michel Bisson)
Tom Dann observed similar differences of 15-25 ug/m3 for colo BAM & SES TEOM in Ottawa on 2/19/03
Continuous Nitrate of 15 to 20 ug/m3 observed in Toronto on 2/19 & 2/29 (data from Jeff Brook)
Similarly High Nitrate of 15 to 20 ug/m3 in Chicago on 2/18/03 (data from Donna Kenski & Chris Price
Extreme Haze observed by
ASOS in BTV on 2/19 & 20 and 3/1/04
(these data are not RH-adjusted
- from STI & CAPITA
FASTNET)
Note Similar conditions all along Eastern US/Canada
border.
Transport generally parallels US/Canada Border for both events
(Note: low HY-SPLIT start heights employed because Mx Ht was very low for both events. Transport Plus Local Stagnation were likely contributors)
PM2.5 from EPA AIRNOW & RH-adjusted bscat: 2/18-20/04
Note Separate areas of high PM concentration and
haze in both Northeast and
Southwest Border Regions on
2/19/04.
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