Environmental Engineering Reference
In-Depth Information
5. Questions and Answers
Question:
The European limit value is expressed in terms of nitrogen dioxide.
Increases in the regional concentration of ozone could therefore offset any
reductions in the emissions of NO
x
(primarily NO) from road vehicles (Bernard
Fisher).
Answer:
The effects of the 80 km h
−1
speed limit are very local and conditioned
by the specific location of the measure; our evaluation of the increase in ozone
is only ranging between 1 and 2 μg m
−3
.
Question:
How significant is the reduction in PM10, which is approximately
2-4%, with respect to the accuracy of PM10 measurement? (Pavel Kishcha)
Answer:
The reduction of PM10 is 4% for the whole Barcelona Metropolitan
Area, but close to the highways is 10%, and this is the representative value.
Also, according to the evaluation of the modelling system for PM10 in this
area, as shown, the agreement with the measures from the air quality network is
highly correlated.
