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The TEOM Series
1400a Ambient Particulate Monitor has a well-established reputation
for providing high quality short term mass concentration data. Two
recent sets of hourly mass concentration results from Italy and
Chile confirm the quality of the unit's hourly readings.
High quality short term measurements may play an important role
in determining some of the linkages that appear to exist between
the ambient particulate matter concentration and indicators of human
health.
In Como, Italy, the regional air monitoring agency operated two
TEOM monitors in parallel as part of an evaluation of PM-10 measurement
methodologies. The precision of the monitor's one-hour mass concentration
readings is demonstrated in the time series graph shown below. The
hourly values show the significant variations that can take place
in the PM-10 concentration within many of the charted 24-hour periods.
The standard deviation of differences for one-hour averages over
the three week period was 2.2 micrograms per cubic meter.
A data set from CONAMA, the regional air quality monitoring agency
in Santiago, Chile, shows hourly results from two TEOM monitors
and an R&P's Series 8400N Ambient Particulate Nitrate Monitor.
The two TEOM monitors were configured to measure the concentration
of particles smaller than 10 microns and 2.5 microns in diameter
(PM-10 and PM-2.5, respectively). The results show the relationship
between the fine particulate matter concentration (PM-2.5) and the
PM-10 concentration, which also contains larger crustal materials.
The Series 8400N
Ambient Particulate Nitrate Monitor is a novel device that provides
high-quality particulate nitrate readings every ten minutes.
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High Quality Hourly Mass Conc Data 
