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

11.4.1 If the spectrophotometeric procedure is used, a manual sample is taken of each
calibration point. Record the ppm of ozone found for each calibration level by
performing the calculations described in the procedure.
12.0 CALCULATIONS
12.1 If a UV photometer was used in the calibration, the ozone readings are the true
ozone concentrations already corrected to standard conditions (25 o C and 101.3
kPa).
Where :
True Ozone (ppm) = Ozone Reading - Zero Reading
Ozone Reading = The UV photometer ozone readout for each calibration point
test atmosphere (11.4)
Zero Reading = The UV photometer ozone readout for the zero air stream
(11.3)
12.2 If a transfer standard was used in the calibration, its ozone readings must be
corrected to standard conditions (25 o C and 101.3 kPa).
Ozone Zero P 298
True Ozone (ppm) = Reading - Reading X ------- X ------------
101.3 t + 273
Where :
Ozone Reading = the transfer standard readout for each calibration, point test
atmosphere (11.4)
Zero Reading = the transfer standard ozone readout for the zero air stream
(11.3)
P = the barometric pressure during the calibration in kPa (11.2)
t = the temperature during the calibration in o C (11.2)
12.3 If the spectrophotometric procedure was used in the calibration the true ozone is
calculated as follows :
True Ozone (ppm) = Ozone Conc.CTA - Ozone Conc.ZAS
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