Algorithm 2: an algorithm to recalculate PM2.5 in a foggy weather

Input: T denotes the daily mean dry-bulb temperature (in degree celsius); RH denotes the instant relative humidity (between 0 and 1); IT denotes the instant on-site temperature (in degree celsius), and PM_CNN denotes the PM2.5 concentrations predicted by CNN in Algorithm 1.

Output: PM2.5 concentration in case the weather is foggy (PM_Image).

Begin

1 if ((PM_CNN) >= 55.50)

2 DT = T – ((100-RH)/5)

3 if ((IT- DT) < 2.5)

4  PO = (PM_CNN)/500.4

5   PM_Image = 55.40 * PO

6 return PM_Image

End