Honda Civic Owner's Manual page 31

After a crash, you may see what
looks like smoke. This is actually
powder from the airbag's surface.
Although the powder is not harmful,
people with respiratory problems
may experience some temporary
discomfort. If this occurs, get out of
the vehicle as soon as it is safe to do
so.
Additional Information About Your Airbags
Dual-Stage Airbags
Your front airbags are dual-stage
airbags. This means they have two
inflation stages that can be ignited
sequentially or simultaneously,
depending on crash severity.
In a crash, both stages
more severe
will ignite simultaneously to provide
the quickest and greatest protection.
In a less severe crash, one stage will
ignite first, then the second stage
will ignite a split second later. This
provides longer airbag inflation time
with a little less force.
Dual-Threshold Airbags
Your front airbags are also dual-
threshold airbags. Airbags with this
feature have two deployment
thresholds that depend on whether
sensors detect the occupant is
wearing a seat belt or not.
If the occupant's belt is
not latched
the airbag will deploy at a slightly
lower threshold, because the
occupant would need extra
protection.
If the occupant's belt is latched
airbag will inflate at a slightly higher
threshold, when the airbag would be
needed to supplement the protection
provided by the seat belt.
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