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Among O
US O
studies O
where O
prevailing O
methods O
such O
as O
chemical O
mass O
balance O
( O
CMB O
) O
and O
positive O
matrix O
factorization O
( O
PMF O
) O
models O
have O
allowed O
for O
estimation O
of O
more O
refined O
source O
contributions O
, O
there O
are O
fewer O
findings O
showing O
the O
significance O
of O
biomass O
burning O
and O
variable O
findings O
on O
the O
relative O
proportion O
of O
BC B-climate-greenhouse-gases
attributed O
to O
diesel B-climate-problem-origins
versus O
gasoline B-climate-problem-origins
emissions O
. O
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We O
use O
the O
Weather B-climate-models
Research I-climate-models
and I-climate-models
Forecast I-climate-models
( O
WRF B-climate-models
) O
model O
driven O
by O
the O
operational O
analysis O
of O
the O
European B-climate-organizations
Centre I-climate-organizations
for I-climate-organizations
Medium I-climate-organizations
- I-climate-organizations
Range I-climate-organizations
Weather I-climate-organizations
Forecasting I-climate-organizations
( O
ECMWF B-climate-organizations
) O
to O
investigate O
the O
impact O
of O
these O
events O
on O