Vehicle exhaust is a leading contributor to air quality concerns. Vehicles and other mobile sources create over half of Iowaβs air pollution! Much of this pollution comes from a small population of poorly maintained vehicles β the easiest ones to spot have visible smoke emissions.
One smoking vehicle creates as much pollution as up to 30 properly functioning cars.
Health Impacts
The tiny particles and other pollutants in vehicle exhaust contribute to respiratory problems and to cancer-risk. Everyone can be affected, but sensitive populations including children, the elderly, and those with respiratory illness are especially at risk. Cleaning up smoking vehicles will improve air quality to help iowans breathe easier.
Perforance Benefits
Excessive exhaust is a clue something is not working properly. Since smoke can be unburned fuel, repairs can yield savings of up to 13% at the gas pumps! Other benefits include enhanced engine performance, higher resale value, reduced emissions, longer engine life, and improved air quality.
Causes & Corrections
Visible tailpipe smoke can vary in color to indicate different engine problems. Use the chart below to help diagnose problems. This is a guide, and not a substitute for consulting an auto technician:
Gasoline Engines
| Visual signs | Diagnosis | Probable causes |
|---|---|---|
| white smoke | low engine temperature (usually occurs during engine start-up) |
|
| coolant or water leaking into combustion chamber |
| |
| blue smoke | engine oil being burned |
|
| black or grey smoke | incomplete fuel combustion |
|
Diesel Engines
| Visual signs | Diagnosis | Probable causes |
|---|---|---|
| white smoke | low engine temperature (usually occurs during engine start-up) |
|
| improper air/fuel mixture |
| |
| blue smoke | engine oil being burned |
|
| black or grey smoke | incomplete fuel combustion |
|