An unexpected adverse effect of daylight saving time may lie in the fact that an extra part of morning rush hour traffic occurs before dawn and traffic emissions then cause higher air pollution than during daylight hours. COUNT 3
QSN1 Do emissions from vehicle exhaust cause lower or higher pollution before dawn? ANS1 higher QSN2 Does DST mean more rush hour traffic is on the road before dawn or after? ANS2 before dawn QSN3 What kind of pollution is caused by emissions from cars while they're sitting in traffic? ANS3 air pollution