Cigarettes, unbelievably, a cigeratte, in one puff can produce around 351 parts per million in particular matter, that is about 7 times more than a car from 99, in a more recent study a 2 liter diesel car was left idling (engine on wheels not turning) for a half hour, it took 3 cigarettes three minutes to achieve the same levels of pollution. enjoy =)
Depends what you mean by 'Worst'
On the other hand if you stay in a close space with heavy smokers, you won't die like with car exhaust.
See: http:/en.wikipedia.org/wiki/Suicide_methods#Carbon_monoxide_poisoning
Carbon Monoxide
smoke poured out of the exhaust of the car.
No, it is composed of mainstream smoke, and sidestream smoke
yes
A headache or worse.
from smoke from car, train exhaust, smoke from refuse burning
Car smoke or exhaust contains many toxic chemicals that are harmful to health and the ozone layer. The major chemical in car exhaust is carbon monoxide.
maybe
its farting
Find and fix exhaust leak
Over 1,000 different substance all in them
There are many things that are making air pollution, but I'll list a few. Car exhaust, factories, even cigarette smoke contributes to air pollution.