Table 1.

Table for individualized air quality index (IAQI) and AQI formulas.

Calculation	Symbol	Explanation
IAQI	IAQIP	Individual air quality index of pollutant item P.
	CP	Concentration value of pollutant item P.
	BPHi	The upper limit for classification of pollutant items and CPs.
	BPLo	The lower limit for classification of pollutant and CPs
	IAQIHi	The upper limit of AQI classification corresponding to BPHi for pollutant items.
	IAQILo	The lower grading limit of AQI value corresponding to BPLo for pollutant items.
AQI	IAQI	Individual air quality index.
	n	Pollutant projects.