ASTM D1357-95(2000)
(Practice)Standard Practice for Planning the Sampling of the Ambient Atmosphere
Standard Practice for Planning the Sampling of the Ambient Atmosphere
SCOPE
1.1 The purpose of this practice is to present the broad concepts of sampling the ambient air for the concentrations of contaminants. Detailed procedures are not discussed. General principles in planning a sampling program are given including guidelines for the selection of sites and the location of the air sampling inlet.
1.2 Investigations of atmospheric contaminants involve the study of a heterogeneous mass under uncontrolled conditions. Interpretation of the data derived from the air sampling program must often be based on the statistical theory of probability. Extreme care must be observed to obtain measurements over a sufficient length of time to obtain results that may be considered representative.
1.3 The variables that may affect the contaminant concentrations are the atmospheric stability (temperature-height profile), turbulence, wind speed and direction, solar radiation, precipitation, topography, emission rates, chemical reaction rates for their formation and decomposition, and the physical and chemical properties of the contaminant. To obtain concentrations of gaseous contaminants in terms of weight per unit volume, the ambient temperature and atmospheric pressure at the location sampled must be known.
1.4 This standard does not purport to address all of the safety concerns, if any, associated with its use. It is the responsibility of the user of this standard to establish appropriate safety and health practices and determine the applicability of regulatory limitations prior to use.
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Designation:D1357–95(Reapproved2000)
Standard Practice for
Planning the Sampling of the Ambient Atmosphere
This standard is issued under the fixed designation D 1357; the number immediately following the designation indicates the year of
original adoption or, in the case of revision, the year of last revision. A number in parentheses indicates the year of last reapproval. A
superscript epsilon (e) indicates an editorial change since the last revision or reapproval.
provide greater details including background information, air quality
1. Scope
modeling techniques, and special purposes air sampling programs (1).
1.1 The purpose of this practice is to present the broad
concepts of sampling the ambient air for the concentrations of
3. Terminology
contaminants. Detailed procedures are not discussed. General
3.1 Definitions—For definitions of terms used in this prac-
principles in planning a sampling program are given including
tice, refer to Terminology D 1356.
guidelines for the selection of sites and the location of the air
sampling inlet.
4. Summary of Practice
1.2 Investigations of atmospheric contaminants involve the
4.1 This practice describes the general guidelines in plan-
study of a heterogeneous mass under uncontrolled conditions.
ning for sampling the ambient air for the concentrations of
Interpretation of the data derived from the air sampling
contaminants.
program must often be based on the statistical theory of
probability. Extreme care must be observed to obtain measure-
5. Significance and Use
ments over a sufficient length of time to obtain results that may
5.1 Since the analysis of the atmosphere is influenced by
be considered representative.
phenomena in which all factors except the method of sampling
1.3 The variables that may affect the contaminant concen-
and analytical procedure are beyond the control of the inves-
trations are the atmospheric stability (temperature-height pro-
tigator, statistical consideration must be given to determine the
file), turbulence, wind speed and direction, solar radiation,
adequacyofthenumberofsamplesobtained,thelengthoftime
precipitation, topography, emission rates, chemical reaction
that the sampling program is carried out, and the number of
rates for their formation and decomposition, and the physical
sites sampled. The purpose of the sampling and the character-
and chemical properties of the contaminant. To obtain concen-
istics of the contaminant to be measured will have an influence
trations of gaseous contaminants in terms of weight per unit
in determining this adequacy. Regular, or if possible, continu-
volume, the ambient temperature and atmospheric pressure at
ous measurements of the contaminant with simultaneous per-
the location sampled must be known.
tinent meteorological observations should be obtained during
1.4 This standard does not purport to address all of the
all seasons of the year. Statistical techniques may then be
safety concerns, if any, associated with its use. It is the
applied to determine the influence of the meteorological
responsibility of the user of this standard to establish appro-
variables on the concentrations measured (2).
priate safety and health practices and determine the applica-
5.2 Statistical methods may be used for the interpretation of
bility of regulatory limitations prior to use.
all of the data available (2). Trends of patterns and relation-
ships between variables of statistical significance may be
2. Referenced Documents
detected. Much of the validity of the results will depend,
2.1 ASTM Standards:
however, on the comprehensiveness of the analysis and the
D 1356 Terminology Relating to Sampling and Analysis of
location and contaminant measured. For example, if 24-h
Atmospheres
samples of suspended particulate matter are obtained only
D 3249 Practice for General Ambient Air Analyzer Proce-
periodically (for example, every 6 or 8 days throughout the
dures
year), the geometric mean of the measured concentrations is
D 3614 Guide for Laboratories Engaged in Sampling and
representative of the median value assuming the data are log
Analysis of Atmospheres and Emissions
normallydistributed.Thegeometricmeanlevelmaybeusedto
NOTE 1—A list of references are appended to this practice which compare the air quality at different locations at which such
regular but intermittent observations of suspended particulate
matter are made.
This practice is under the jurisdiction of ASTM Committee D22 on Sampling
and Analysis of Atmospheres and is the direct responsibility of Subcommittee
D22.03 on Ambient Atmospheres and Source Emissions.
Current edition approved Jan. 15, 1995. Published March 1995. Originally
published as D 1357 – 55T. Last previous edition D 1357 – 94. The boldface numbers in parentheses refer to the list of references at the end of
Annual Book of ASTM Standards, Vol 11.03. this practice.
Copyright © ASTM International, 100 Barr Harbor Drive, PO Box C700, West Conshohocken, PA 19428-2959, United States.
D1357–95 (2000)
6. Basic Principles and in the interpretation of the data. Pertinent meteorological
and climatological information may be obtained from the local
6.1 The choice of sampling techniques and measurement
weatherdepartment.Inmanylocalities,however,themicrome-
methodology, the characteristics of the sites, the number of
teorology may be unique and meteorological investigations to
sampling stations, and the amount of data collected all depend
provide data specific to the area may be needed.
on the objectives of the monitoring program. These objectives
7.2 The influences of each of the meteorological parameters
may be one or more of the following:
important to air quality are discussed in detail. The methods of
6.1.1 Air quality assessment including determining maxi-
carrying out the related meteorological investigations are also
mum concentration,
discussed (3, 4, 5).
6.1.2 Health and vegetation effects studies,
6.1.3 Trend analysis,
8. Topographical Factors
6.1.4 Evaluation of pollution abatement programs,
6.1.5 Establishment of air quality criteria and standards by 8.1 Topography can influence the contaminant concentra-
tions in the atmosphere. For example, a valley will cause
relating to effects,
6.1.6 Enforcement of control regulations, persistenceinwinddirectionsandintensifylow-levelnocturnal
inversions that will limit the dispersion of pollutants emitted
6.1.7 Development of air pollution control strategies,
6.1.8 Activation of alert or emergency procedures, into it. Mountains or plateaus may act as barriers affecting the
flow of air as well as the contaminant concentrations in their
6.1.9 Land use, transportation, and energy systems plan-
vicinity. Consideration should be given to the influence of
ning,
these features as well as that of large lakes, the sea, and oceans
6.1.10 Background evaluations, and
(2, 3).
6.1.11 Atmospheric chemistry studies.
6.2 In order to cover all the variable meteorological condi-
9. Apparatus
tions that may greatly affect the air quality in an area, air
monitoring for lengthy periods of time may be necessary to
9.1 Details of the apparatus or instruments employed in
meet most of the above objectives.
sampling the air or carrying out associated meteorological
6.3 The topography, demography, and micrometeorology of
investigations are discussed in other ASTM methods and
the area as well as the contaminant measured, must be
recommendations.
considered in determining the number of monitoring stations
required in the area. Photographs and a map of the locations of
10. Sampling Procedure and Siting Concepts
the sampling stations is desirable in describing the sampling
10.1 The choice of procedure for the air sampling is
station.
dependent on the contaminant to be measured. See Practice
6.4 Unless the purpose of the sampling programs is site
D 3249 for recommendations for general ambient air analyzer
specific, the sites monitored should, in general, be selected so
procedures. ASTM recommended methods have been pub-
as to avoid undue influence by any local source that may cause
lished for most of the common contaminants that are sampled.
local elevated concentrations that are not representative of the
Automatic instruments providing a continuous record of the
region to be characterized by the data.
concentrations of the contaminant should be utilized whenever
6.5 Monitoring sites for determining the impact on air
possible to save manpower and increase efficiency. Very often
quality by individual sources should be selected, if possible, so
factors such as temperature, humidity, and vibrations, as well
as to isolate the effect of the source being considered. When
as the power line voltage can influence the output of the air
there are many sources of the contaminant in the area, the sites
monitoring instrument and these should be controlled.
sampled should be strategically located so that with wind
10.2 The monitors must be supplied with sample air that
direction data obtained simultaneously near the sites, the
represents the ambient air under investigation. Careful consid-
monitoringresultswillprovideevidenceofthecontributionsof
erationshouldbegiventothes
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