3.2. Data analysis and data indexing
3.2.1. Air quality indexing
The Air Quality Index (AQI) is an index for reporting daily air quality. The index is based on results obtained 24 h previously and takes five pollutants into account: Nitrogen oxides (NOx), suspended particulates (PM10), Carbon monoxide (CO), Sulfur dioxide (SO2) and ground-level Ozone (O3). Calculations of the Israeli AQI, used by the Ministry of Environment, are largely based on the EPA Pollutant Standard Index, adapted to Israeli standards and divided to 4 air quality categories using the scale: good (green color), moderate (yellow), high (orange) and very high (red). According to the Israeli AQI a positive index indicates no expedience of any standard while a negative index indicates an expedience for at least one pollutant. Since SO2 concentrations in Tel-Aviv were very low, this study did not measure this pollutant (Gabby, 2002).
Prior to determining the AQI, the Pollutant Standards Index (PSI) of each of the measured pollutants was calculated according to Equation (1) in the Israeli manual
3.2. Data analysis and data indexing3.2.1. Air quality indexingThe Air Quality Index (AQI) is an index for reporting daily air quality. The index is based on results obtained 24 h previously and takes five pollutants into account: Nitrogen oxides (NOx), suspended particulates (PM10), Carbon monoxide (CO), Sulfur dioxide (SO2) and ground-level Ozone (O3). Calculations of the Israeli AQI, used by the Ministry of Environment, are largely based on the EPA Pollutant Standard Index, adapted to Israeli standards and divided to 4 air quality categories using the scale: good (green color), moderate (yellow), high (orange) and very high (red). According to the Israeli AQI a positive index indicates no expedience of any standard while a negative index indicates an expedience for at least one pollutant. Since SO2 concentrations in Tel-Aviv were very low, this study did not measure this pollutant (Gabby, 2002).Prior to determining the AQI, the Pollutant Standards Index (PSI) of each of the measured pollutants was calculated according to Equation (1) in the Israeli manual
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