|Ozone PM2.5 PM10 Carbon Monoxide Nitrogen Dioxide Sulfur Dioxide Lead
Vermont operated two ozone (O3)
monitoring sites in 2001; one at the Proctor Maple Research Facility in
Underhill and the other in Bennington. The 8-hour average ozone National
Ambient Air Quality Standard (NAAQS) is 0.08 parts per million (ppm) and
is assessed relative to the running 3-year average of the annual 4th maximum
daily maximum 8-hour average. Based on this criteria, both Underhill and
Bennington are 100% of the NAAQS (0.08 ppm) for 2001; this is in compliance
with the standard, which must not be exceeded. The highest 8-hour concentration
of ozone in 2001, 0.093 ppm, was recorded at the Bennington site. The
highest recorded 8-hour concentration of ozone at the Proctor Maple Research
site was 0.082 ppm. The highest 1-hour concentration of ozone in 2001,
0.102 ppm, was recorded at the Bennington site while the highest recorded
1-hour concentration of ozone at the Proctor Maple Research Facility was
Vermont maintained five monitoring sites
that sampled for particulate matter with aerodynamic diameter < 2.5
microns (PM2.5). PM2.5 sampling in 2001 was conducted
in Barre, Bennington, Burlington, Rutland and Underhill. Vermont began
PM2.5 sampling in 1999. The annual average PM2.5
standard is assessed relative to the three-year average of the respective
annual averages. The PM2.5 annual average NAAQS is 15 micrograms
per cubic meter (µg/m3). Compliance
was assessed at the four sites in which three years of sampling has been
conducted (Barre, Bennington, Rutland and Underhill). Three-year averages
ranged from 6.8 µg/m3 in Underhill (45% of NAAQS) to 11.3 µg/m3 in Rutland
(76% of NAAQS). The Burlington assessment is incomplete since it is only
a two-year average; however, that two-year average is 9.0 µg/m3
or 60% of NAAQS. The PM2.5 24-hour average standard is assessed relative
to the three-year average of the annual 98th percentile sample concentration.
Given Vermont's 1-in-3 day sampling schedule, the annual 98th percentile
concentration is the annual third 24-hour maximum concentration. The PM2.5
24-hour standard is 65 µg/m3. Again,
compliance was assessed at four sites and the averages ranged from 21
µg/m3 in Underhill (32% of NAAQS)
to 30 µg/m3 in Rutland (46% of NAAQS).
The Burlington assessment is incomplete since sampling has only been conducted
for two years; however, the two-year average is 26 µg/m3
or 40% of standard.
In 2001, Vermont maintained five monitoring
sites that sampled for particulate matter with aerodynamic diameter <
10 microns (PM10). These sites include Barre, Bennington, Burlington,
Rutland and Underhill. The highest 24-hour concentration was recorded
at the Barre site, which recorded a maximum 24-hour PM10 concentration
of 50 µg/m3. Rutland recorded the
highest annual PM10 average (weighted) concentration of all
Vermont sites, 19 µg/m3. These concentrations
are well below the former PM10 annual maximum 24-hour average
NAAQS of 150 µg/m3 and the PM10
annual average NAAQS of 50 µg/m3.
The lowest recorded PM10 annual average for 2001 was recorded
Proctor Maple Research facility monitoring site in Underhill (10 µg/m3).
The lowest recorded maximum 24-hour concentration was recorded in Bennington
(42 µg/m3). Over the past five years
all five PM10 monitoring sites have recorded particulate matter
concentrations below the former annual and 24-hour NAAQS. Yearly variability
in the data is common, in part determined by meteorology, transport of
particulate matter from distant sources, and changes in the emission strength
of local sources.
During 2001, Vermont operated one Carbon
Monoxide (CO) site in Rutland. No exceedance of the NAAQS for CO was recorded.
The highest 1st and 2nd maximum 8-hour concentrations of CO recorded at
Rutland were 2.4 ppm and 2.2 ppm, respectively. The five-year trend line
shows only small fluctuations of the second highs with levels between
24% and 37% of the 8-hour NAAQS. The Burlington CO site was not in operation
in 2001; however it was in operation during the period of 1995 to 1999.
The second 8-hour maximums during that time period ranged between 24%
and 37% in Burlington as well. In 2001, the maximum one-hour concentration
of CO recorded was 4.4 ppm.
Vermont operated one nitrogen dioxide (NO2)
monitoring site in Rutland in 2001. No exceedance of the NAAQS for NO2
was recorded. Historical data for the most recent five years (1997-2001)
indicate that the annual average concentrations of NO2 have
remained relatively stable. During this time period, the annual averages
for the Rutland site ranged from 0.011 ppm to 0.013 ppm NO2.
The Burlington NO2 site was not in operation in 2001. During
the period of 1996 to 2000, the annual average NO2 concentrations
ranged from 0.017 ppm to 0.018 ppm in Burlington. The five-year annual
NO2 average trend in Burlington and Rutland ranged between
21% to 34% of the NAAQS. In 2001, the maximum one-hour concentration of
NO2 recorded was 0.053 ppm.
In 2001, Vermont maintained one sulfur dioxide
(SO2) monitoring site in Rutland. No exceedance or violation
of the NAAQS for sulfur dioxide was recorded. The highest 24-hour average
concentration of SO2 in Rutland in 2001 was 0.024 ppm. The
highest 3-hour and 1-hour average SO2 concentrations were 0.045
and 0.063 ppm, respectively. The annual average of 0.005 ppm in Rutland
for 2001 is 17% of the NAAQS. For compliance purposes, the annual second
maximum 24-hour average of 0.024 ppm is 17% of the NAAQS as well. The
annual second maximum 3-hour average of 0.040 ppm is 8% of the NAAQS.
Five years (1997-2001) of historical SO2 data indicate a slight
decline in SO2 concentrations in Rutland (from 0.007 ppm annual
average SO2 in 1997 to 0.005 ppm in 2001).
Vermont is not required to measure the concentration
of lead in ambient air. No measurement data are available. [Note: The
Vermont Air Pollution Control Division discontinued monitoring lead concentrations
in Vermont in 1989.]