|
| 
Cairo
-O3-
| Observation |
| Category |
: |
Air sampling observation |
| Situation |
: |
ongoing |
| Time zone |
: |
Local time +2 |
| Sampling |
| Sampling height |
: |
+35 |
| Description |
: |
continuous |
| Sampling and analysis frequency |
: |
continuous
sampling every second with one hour average |
| Sampling environment |
: |
in Cairo megacity which it is polluted city |
| Description for sampling analysis |
: |
measure the concentration of surface O3 from ambient air through Teflon tubes with one liter/minute flow rate. |
| Instrument and Analysis |
| Measurement method |
: |
Light absorption analysis (UV) |
| Current status and history of instrument |
: |
Starts in
Jun 2010
Thermo Scientific
Model 49i Ozone Analyzer |
| Description of instrument |
: |
Ranges : 0 to 0.05, 0.1, 0.2, 0.5, 1, 2, 5, 10, 20, 50,100 and 200ppm
Flowrate : 1 to 3L/min.
Precision : 1.0ppb
Linearity : ±1% full scale
Response Time : 20 seconds (10 second lag time)
Zero Noise : 0.25 ppb RMS (60 second averaging time)
Zero Drift: (24 hour) <1.0ppb
Span Drift: <1% full scale per month |
| Calibration |
| Current scale employed in the measurement |
: |
0-100 ppb |
| Measurement calibration |
: |
Calibration with zero air and ozone by UV photometric Ozone Primary Standard for calibration (Thermo 49i-Ps)
calibration factors:
Zero:0.5 ppb
Span: 0.991 |
| Scale and calibration(treasability) |
: |
last calibration was in 13/06/2010 |
| Data Processing |
| Measurement unit |
: |
ppb |
| Data processing |
: |
Data and collected via CR1000 Campbell datalogger to gives hourly average and standard deviation |
| Processing for averaging |
: |
Processing for Hourly Data:
every second with one hour average
|
| Data flag |
: |
Flag: Data Category
0: Background data
1: Data possibly affected by pollution (wind direction is W - SW)
2: Insufficient number of averaging data
3: Invalid data |
| Data remarks |
: |
"S" means using the in situ CO2 measurement air intake system. |
| Other Information |
| Scientific aim |
: |
measure amount of surface ozone |
| Reference |
: |
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|
| submitted by Egyptian Meteorological Authority |
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