Processing math: 100%

First grade indexes	Second grade indexes	Third grade indexes	Symbol
The Comprehensive Index of Fog-Haze Risk	The pollutants in the air	Particulate concentration	$f_{1}$
		Average annual SO₂ concentration	$f_{2}$
		Average annual NO₂ concentration	$f_{3}$
	Industrial Pollutant emissions	Total industrial emissions	$f_{4}$
		Industrial sulfur dioxide emissions	$f_{5}$
		Industrial smoke and dust emissions	$f_{6}$
	Transportation pressure	Private vehicle ownership/Road mileage	$f_{7}$