The Community Multiscale Air Quality (CMAQ) Model forecast guidance is produced 
by the National Centers for Environmental Prediction (NCEP) and is provided to 
the Environment Protection Agency (EPA).  The air quality forecast guidance is
also available on NWS servers to users.


For Additional information, go to the National Air Quality Forecast Capability web page.

WMO Headings have the format of T1T2A1A2ii CCCC .

The CCCC for all CMAQ product WMO headings is KWBP .

The T1 for all CMAQ product WMO headings is L.

CMAQ Data Type Designator (T2)


A = UNASSIGNED
B = UNASSIGNED
C = UNASSIGNED
D = UNASSIGNED
E = UNASSIGNED
F = UNASSIGNED
G = UNASSIGNED
H = UNASSIGNED
I = UNASSIGNED
J = UNASSIGNED
K = UNASSIGNED
L = 8-hour Backward Average
M = 1-hour Backward Average
N = UNASSIGNED
O = UNASSIGNED
P = UNASSIGNED
Q = UNASSIGNED
R = UNASSIGNED
S = UNASSIGNED
T = UNASSIGNED
U = UNASSIGNED
V = UNASSIGNED
W = UNASSIGNED
X = 1 Hour Smoke particulate matter of surface and column Integrated Concentrations
Y = 8-hour Averaged Categorical Ozone Concentration
Z = 1-hour Averaged Categorical Ozone Concentration

 

CMAQ Area Designator (A1)


A= PUERTO RICO
B= UNASSIGNED
C= UNASSIGNED
D= UNASSIGNED
E= UNASSIGNED
F= UNASSIGNED
G= UNASSIGNED
H= UNASSIGNED
I= UNASSIGNED
J= UNASSIGNED
K= UNASSIGNED
L= UNASSIGNED
M= UNASSIGNED
N= UNASSIGNED
O= UNASSIGNED
P= UNASSIGNED
Q= 3 X
R= ALASKA
S= HAWAII
T= UNASSIGNED
U= 5 X
V= UNASSIGNED
W= UNASSIGNED
X= UNASSIGNED
Y= UNASSIGNED
Z= UNASSIGNED


CMAQ Reference Time Designator (A2 and ii)


A = Day 0   ii = hour (0-23)
B = Day 1   ii = hour (0-23)
C = Day 2   ii = hour (0-23)
D = Day 3   ii = hour (0-23)
E = Day 4   ii = hour (0-23)
F = Day 5   ii = hour (0-23)
G = Day 6   ii = hour (0-23)
H = Day 7   ii = hour (0-23)
I = Day 8   ii = hour (0-23)
J = Day 9   ii = hour (0-23)
K = Day 10  ii = hour (0-23)
L = Day 11  ii = hour (0-23)
M = Day 12  ii = hour (0-23)
N = Day 13  ii = hour (0-23)
O = Day 14  ii = hour (0-23)
P = UNASSIGNED
Q = UNASSIGNED
R = UNASSIGNED
S = UNASSIGNED
T = UNASSIGNED
U = UNASSIGNED
V = UNASSIGNED
W = Weeks  ii = week # (0-99)
X = Months  ii = month # (0-99)
Y =  Year ii = year # (0-99)
Z = Super heading designator ii always = 99