By Keiko Hirota
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Extra info for A methodology of estimation on air pollution and its health effects in large Japanese cities
3. Results and discussion For all sites, we have calculated the mean, standard deviation, and maximum, and we also calculated the geometric means. The geometric mean is the basis of preparing the air quality standards. The mean, standard deviation, maximum value, and geometric mean values are listed as below: 40 Air Quality – Monitoring and Modeling RSP OKHLA GEO MEAN MEAN STD DEV. MAXIMUM IIT GEO MEAN MEAN STD DEV. MAXIMUM VV GEO MEAN MEAN STD DEV. MAXIMUM SKP GEO MEAN MEAN STD DEV. MAXIMUM Delhi GEO MEAN MEAN STD DEV.
This data set includes the averages, the medians and the standard deviations for measured and simulated values, the mean error (bias), the normalized residue (FB), the normalized square error (NMSE), the correlation coefficient (R2) and the fraction of predicting the measured values up to a factor 2 (FA2) (Raducan, 2008b). 1 0 Device 1 Device 2 Device 3 Device 4 Device 5 Monitoring devices Device 6 Device 7 Fig. 7. The statistical parameters: the averages, the medians calculated for measured and modeled data If the values of the averages and medians for both sets of data (modeled and measured) are close, it means that there are not very large extreme values which could be wrong.
These, according to the standards, may be: 1. 2. 3. 4. Urban Background Station (for nitrogen oxides, ozone, aerosol particles and sulfur dioxide (optional)); Industrial / Residential Station (for nitrogen oxides, sulfur dioxide, aerosol particles and possibly other compound-specific ammonia or volatile organic compounds); Traffic Station (for nitrogen oxides, carbon monoxide, aerosol particles, volatile organic compounds (benzene) and sulfur dioxide (optional)); Regional Background Station (for nitrogen oxides, sulfur dioxide, ozone, aerosol particles, volatile organic compounds).