Houston

C35

C55/113

C108

C416

CO

x

x

SO₂

x

x

x

NO₂

x

x

x

O₃

x

x

x

x

RWS

x

x

x

x

RWD

x

x

x

x

OT

x

x

x

x

RH

x

x

x

x

PM_2.5 (Acceptable)

x

x

x

PM₁₀

x

PM_2.5

x