Pollutant

Stations needed to achieve MAPE < 25

O3

1, 2, 3, 5, 6, 7, 9, 10, 14, 16

NOx

1, 2, 4, 8, 9, 10, 12, 13, 15

SO2

2, 3, 5, 7, 8, 9, 10, 11, 12, 14, 16

CO

1, 3, 4, 5, 6, 7, 8, 11, 12, 13, 15