Ambient Air quality Monitoring Guidlines. - Maharashtra Pollution ...

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The primary requirement for conducting inter-laboratory comparison on physical and chemical methods for measurement of air pollutants is depicted in Fig. 5.2. This system is primarily known as Ring Test Facility. It mainly consists of several mass flow meters of different flow capacities. A mass flow controller, regulates these mass flow meters. Provision for producing the dilute air is done by means of compressor. The compressed air produced by the compressor is dried and purified by passing the air through silica gel and activated carbon respectively. The standard gas stored in steel cylinders is diluted to the desired concentration by the dilution air or zero air. It is difficult to store nitrogen dioxide in pressurised cylinders due to its unstable nature. Therefore nitric oxide stored in steel cylinders are converted to nitrogen dioxide by means of a process called Gas Phase titration (GPT). In order to attain GPT, nitric oxide is allowed to react with ozone ( produced by an ozone generator) to produce nitrogen dioxide. The ozone generator used for GPT can also produce desired ozone gas mixtures for calibration of continuous monitoring analysers and proficiency testing. In order to check the mixing of gas mixtures it is advisable to install the continuous monitoring analysers on the Ring Test Facility. The calibration of the continuous monitoring analysers is accomplished by means of static dilution system. The static dilution system is shown in Fig.5.3. The standard gas mixtures produced by the Ring Test Facility are made available to different participants through a glass tube for inter-laboratory comparison exercises. (i) Choice Of Method/Procedure Participants can use the method of their choice, which is consistent with routine procedures used in their laboratories. However, in certain circumstances, the coordinator may instruct participants to use a specified method. Such methods are usually nationally or internationally accepted standard methods, and will have been validated by an appropriate procedure ( e.g. collaborative trial). Where calibration procedure is used, the assigned value will often be a reference value obtained from measurements obtained by a reputed calibration laboratory which should use a well defined and accepted procedure. It is desirable that participating laboratories use the same or similar procedure, but this will not always be practicable for calibration laboratories. 94
<strong>Ambient</strong> air N2GAS (100%) COMPRESSOR 200 LITRE STORAGE TANK GPT= Gas Phase Titration MFC= Mass Flow Controllers SILICA GEL (for drying ) ZERO AIR Zero <strong>Air</strong> ACTIVATED CHARCOAL (For purifying) GAS CYLINDER (NO/SO2/CO) 95 MFC (0-100 LPM) MFC (0-100 LPM) MFC (0-5 LPM) MFC (0-50 MLPM) MFC (0-5 LPM) MFC (0-50 MLPM) CONTROLLING UNIT OF MFC WET CHEMICAL SAMPLING SYSTEM Figure 5.2: Ring Test Facility. GAS SAMPLING LINE PERMEATION OVEN CUM OZONE GENERATOR WATER BOTTLE FOR HUMIDITY MIXING CHAMBER AUTOMATIC ANALYZER GPT REACTION TUBE (NO + O3 = NO2 + O2)
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1.0 INTRODUCTION Air pollutants are
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The Central Pollution Control Board
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S.No. Problem Area Type of Industry
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(viii) High population exodus to th
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a) Seasonal Variation in Carbon Mon
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Concentration (µg/m 3 ) 2.2.3 Long
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3.2 National Air Monitoring Program
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Number of Monitoring Stations 40 35
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4.0 GUIDELINES FOR MONITORING For s
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The variability of pollutant concen
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areas, traffic intersections etc. O
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Station Type Description Type C Res
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available then monitoring of specif
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manpower and needs to be calibrated
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averaging should be done and plotte
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necessary to readjust the position
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5.0 QUALITY ASSURANCE AND QUALITY C
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(a) Inter Laboratory Proficiency Te
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2. Infrastructure for conducting In
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ZERO GAS VALVE PRESSURE REGULATOR (
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is to assess its ability to perform
Page 43 and 44: The mixing ratio of O3 (ppb) must n
Page 45 and 46: (vi) Lack of Dedicated Manpower If
Page 47 and 48: Site staff must be trained so that
Page 50 and 51: NATIONAL AMBIENT AIR QUALITY MONITO
Page 52 and 53: Delhi - 110 032 e-mail : cpcb@alpha
Page 54 and 55: FOREWORD Under the Air (Prevention
Page 56 and 57: Table No. References 161 LIST OF TA
Page 58 and 59: 3.0 INTRODUCTION Air pollutants are
Page 60 and 61: The Central Pollution Control Board
Page 62 and 63: S.No. Problem Area Type of Industry
Page 64 and 65: (viii) High population exodus to th
Page 66 and 67: Monthly average of CO measured at B
Page 68 and 69: Concentration (µg/m 3 ) 2.2.3 Long
Page 70 and 71: 3.2 National Air Monitoring Program
Page 72 and 73: Number of Monitoring Stations 40 35
Page 74 and 75: 4.0 GUIDELINES FOR MONITORING For s
Page 76 and 77: The data requirements, which are re
Page 78 and 79: their levels and determine trends.
Page 80 and 81: Station Type Description traffic vo
Page 82 and 83: Criteria for SO2 Measurements Sourc
Page 84 and 85: calibration parameters change. Meas
Page 86 and 87: The following must be followed for
Page 88 and 89: changed in inclement weather. Set t
Page 90 and 91: 5.0 QUALITY ASSURANCE AND QUALITY C
Page 92 and 93: (a) Inter Laboratory Proficiency Te
Page 96 and 97: ZERO GAS VALVE PRESSURE REGULATOR (
Page 98 and 99: is to assess its ability to perform
Page 100 and 101: The mixing ratio of O3 (ppb) must n
Page 102 and 103: (xiii) Lack of Dedicated Manpower I
Page 104 and 105: laboratory staff must be trained so
Page 106 and 107: 1. AIR SAMPLING - GASEOUS 1.0 TITLE
Page 108 and 109: 52 Fig. 1 Sampling Train
Page 110 and 111: 54 Fig. 4 Critical Orifice Device
Page 112 and 113: the pollutant and accordingly selec
Page 114 and 115: contracts with change in humidity.
Page 116 and 117: and temperature has been set down i
Page 118 and 119: The impulse frequency emitted is pr
Page 120 and 121: CIRCUIT DIAGRAM - 1 64
Page 122 and 123: FIG. 1 (a) CIRCUIT DIAGRAM 66
Page 124 and 125: 3. DETERMINATION OF SUSPENDED PARTI
Page 126 and 127: measurement precision dominates at
Page 128 and 129: 6.4.4 Equilibration Rack - This rac
Page 130 and 131: Receive Filters, inspect (light tab
Page 132 and 133: of the face-plate. Look underneath
Page 134 and 135: Atmosphere". Federal Register, 52 F
Page 136 and 137: 5.0 INTERFERENCES 5.1 Passive Depos
Page 138 and 139: 6.4.4 Numbering Machine - Though fi
Page 140 and 141: chain-of-the custody log-book and o
Page 142 and 143: 5. DETERMINATION OF SULPHUR DIOXIDE
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88 FIG. 1.0 SO2 SAMPLING TRAIN
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The wavelength calibration of the i
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(ii) The absorbance of the reagent
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pipe cleaner after use. If, the tem
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(A - Ao) (10 3 ) (B) C = ----------
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Then the air sample flows into a re
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integral part of the apparatus, or
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6.4 Pressure Regulator The output s
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FIG. 2 SCHEMATIC DIAGRAM OF A CALIB
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7. CONTINUOUS MEASUREMENT OF CARBON
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6.0 APPARATUS 6.1 NDIR Analyser - f
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BLOWER SAMPLE INLET PORT FOUR WAY V
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Maintain the same sample cell flow
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14.0 CALIBRATION PROCEDURE 14.1 Ana
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connected to the output manifold, t
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FIG. 3 MULTIPLE CYLINDER CALIBRATIO
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(Nondispersive Infrared Spectrometr
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5.0 INTERFERENCES 5.1 Nitric oxide
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7.1.6 Air Pump - Capable of maintai
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9.1.3.2 Solution B - Pipet 25 ml of
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9.4.7 A randomly selected 5-10% of
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9. CONTINUOUS MEASUREMENT OF OXIDES
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8.0 APPARATUS 8.1 Chemiluminescene
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SAMPLE INLET PUMP AIR DRYER OZONE G
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FIG. 3 CALIBRATION SYSTEM COMPONENT
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10.3.1 Flow Conditions - Insure tha
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ates constant. For each calibration
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10. DETERMINATION OF OZONE IN THE A
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7.0 APPARATUS 7.1 Sampling Probe -
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9.4 Blank Correction - Measure the
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11. CONTINUOUS MEASUREMENT OF OZONE
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FIG. 1 SCHEMATIC DIAGRAM OF A TYPIC
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8.2 Air Inlet Filter - A Teflon fil
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9.0 REAGENTS 9.1 Purity - All reage
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Where : Ozone Conc.CTA = the ozone
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1. AIR SAMPLING - GASEOUS 1.0 TITLE
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55 Fig. 1 Sampling Train
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57 Fig. 4 Critical Orifice Device
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the pollutant and accordingly selec
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(iii) Technical Data Measuring rang
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3.1.3 Wind Speed Temperature measur
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(v) Preparation for Use (a) Selecti
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CIRCUIT DIAGRAM - 1 67
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FIG. 1 (a) CIRCUIT DIAGRAM 69
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3. DETERMINATION OF SUSPENDED PARTI
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measurement precision dominates at
Page 236 and 237:
6.4.4 Equilibration Rack - This rac
Page 238 and 239:
Receive Filters, inspect (light tab
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of the face-plate. Look underneath
Page 242 and 243:
Atmosphere". Federal Register, 52 F
Page 244 and 245:
5.0 INTERFERENCES 5.1 Passive Depos
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6.4.4 Numbering Machine - Though fi
Page 248 and 249:
chain-of-the custody log-book and o
Page 250 and 251:
5. DETERMINATION OF SULPHUR DIOXIDE
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91 FIG. 1.0 SO2 SAMPLING TRAIN
Page 254 and 255:
The wavelength calibration of the i
Page 256 and 257:
(ii) The absorbance of the reagent
Page 258 and 259:
pipe cleaner after use. If, the tem
Page 260 and 261:
(A - Ao) (10 3 ) (B) C = ----------
Page 262 and 263:
Then the air sample flows into a re
Page 264 and 265:
integral part of the apparatus, or
Page 266 and 267:
6.4 Pressure Regulator The output s
Page 268 and 269:
FIG. 2 SCHEMATIC DIAGRAM OF A CALIB
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7. CONTINUOUS MEASUREMENT OF CARBON
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6.0 APPARATUS 6.2 NDIR Analyser - f
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BLOWER SAMPLE INLET PORT FOUR WAY V
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Maintain the same sample cell flow
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14.0 CALIBRATION PROCEDURE 14.1 Ana
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connected to the output manifold, t
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FIG. 3 MULTIPLE CYLINDER CALIBRATIO
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(Nondispersive Infrared Spectrometr
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5.0 INTERFERENCES 5.1 Nitric oxide
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7.1.6 Air Pump - Capable of maintai
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9.1.3.2 Solution B - Pipet 25 ml of
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9.4.7 A randomly selected 5-10% of
Page 294 and 295:
9. CONTINUOUS MEASUREMENT OF OXIDES
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9.0 APPARATUS 8.1 Chemiluminescene
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SAMPLE INLET PUMP AIR DRYER OZONE G
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FIG. 3 CALIBRATION SYSTEM COMPONENT
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10.6.1 Flow Conditions - Insure tha
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ates constant. For each calibration
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10. DETERMINATION OF OZONE IN THE A
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7.0 APPARATUS 7.1 Sampling Probe -
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9.4 Blank Correction - Measure the
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11. CONTINUOUS MEASUREMENT OF OZONE
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FIG. 1 SCHEMATIC DIAGRAM OF A TYPIC
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8.2 Air Inlet Filter - A Teflon fil
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9.0 REAGENTS 9.3 Purity - All reage
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Where : Ozone Conc.CTA = the ozone
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