Short-Term Air Quality Prediction Based on Fractional Grey Linear Regression and Support Vector Machine

Table 1

24-hour air pollutant standard (implemented since 2016 in China).

	Meet the standard	Fail to meet the standard
PM10	0∼150 μg/m³	>150 μg/m³
PM2.5	0∼75 μg/m³	>75 μg/m³
NO2	0∼80 μg/m³	>80 μg/m³