PA EMISSIONS INSPECTOR
CERTIFICATION EXAM WITH
CORRECT ANSWERS 2025
Station Hotline ( Correct answers ) (888) 265-
5909
Customer Hotline ( Correct answers ) (800) 265-
0921
Sticker Department ( Correct answers ) (717) 705-
2182
An emissions inspector must meet what requirements? ( Correct answers ) Be
least 18 years of
at
Have a valid driver's
age
license
To deliver emissions waivers you must become a(n)... ( Correct answers )
Certified Repair Technician
emissions
(CRT)
To become a CRT you must... ( Correct answers ) Have a valid driver's
license
What is the Northern-Emission Inspectors Certification program? ( Correct
answersto) performing the visual antitampering check and gas-cap
Limited
test.
Upon successful completion of the N-EIC program you will receive.. ( Correct
answers
) An emissions inspection ID card from PennDOT that allows you to
perform
inspections on vehicles registered in the Northern Region counties
only.
Air pollution ( Correct answers ) Contamination of the atmosphere by gaseous,
or solid wastes or byproducts. Emitted from natural or human-made
liquids
sources.
Most of the world's air pollution problems are... ( Correct answers ) Human-
made
Major Pollutants ( Correct answers ) Hydrocarbons (HCs), carbon monoxide (CO),
nitrogen oxides (NOx). (released from fossil fuels like gasoline and
and
diesel)
Hydrocarbons ( Correct answers ) Unburned fuel of any class of organic
composed of carbon and
compounds
hydrogen
Carbon Monoxide ( Correct answers ) Colorless, odorless, and poisonous gas.
when an engine burns HV in the presence of
Created
O2.
, Oxygen ( Correct answers ) Too much or too little can cause improper combustion
and result in pollution
Ozone (Smog) ( Correct answers ) Not emitted directly into the air, it is created at
ground level by a chemical reaction between NOx and HC in the presence of
sunlight .
Nitrogen Oxides (NOx) ( Correct answers ) Excessive amounts can be caused by
lean air-fuel mixture, a defective exhaust gas recirculation valve, higher than
a
engine temperatures, vacuum leaks, and advanced ignition
normal
timing.
Five Gas Theory ( Correct answers ) The relationship between HC, CO, O2, CO2,
and NOx are the same in all gasoline engines.
Stoichiometric Ratio ( Correct answers ) For all engines, a mixture of approx.
parts of air to every one-part of fuel produces the most efficient use of fuel and
14.7
lowest
the
emissions.
Why would hydrocarbon be higher than the stoichiometric ratio? ( Correct
answers ) The mixture is very rich or very lean. Normal combustion is 15:1 air/fuel
ratio.
What happens when there is not enough O2 in an engine? ( Correct answers ) It
runs rich, meaning combustion forms more CO and less CO2.
What does it mean if Hc is high and CO is extremely low? ( Correct answers )
The engine is either very lean or there's a misfire.
What does it mean if CO is very high? ( Correct answers ) The engine is definitely
rich, getting too much fuel or not enough air.
Why is oxygen the best lean indicator? ( Correct answers ) The levels change
during lean mixtures.
Why is oxygen (O2) not a reliable rich indicator? ( Correct answers ) It is
low whenever the mixture is rich. Rich mixtures burn all available O2.
When did PA implement itd first emissions I/M program? ( Correct answers )
1984
In 1990 Congress set the requirements for an enhanced program in the Clean Air
Amendments which aimed to do what? ( Correct answers ) Lower harmful
Act
emissions
and increase accountability at the state
level.
What was the 1992 EPA mandate in accordance with the Clean Air Act?
( Correct ) PA required a vehicle emissions I/M program be implemented to
answers
increase
air quality and decrease
pollution.
CERTIFICATION EXAM WITH
CORRECT ANSWERS 2025
Station Hotline ( Correct answers ) (888) 265-
5909
Customer Hotline ( Correct answers ) (800) 265-
0921
Sticker Department ( Correct answers ) (717) 705-
2182
An emissions inspector must meet what requirements? ( Correct answers ) Be
least 18 years of
at
Have a valid driver's
age
license
To deliver emissions waivers you must become a(n)... ( Correct answers )
Certified Repair Technician
emissions
(CRT)
To become a CRT you must... ( Correct answers ) Have a valid driver's
license
What is the Northern-Emission Inspectors Certification program? ( Correct
answersto) performing the visual antitampering check and gas-cap
Limited
test.
Upon successful completion of the N-EIC program you will receive.. ( Correct
answers
) An emissions inspection ID card from PennDOT that allows you to
perform
inspections on vehicles registered in the Northern Region counties
only.
Air pollution ( Correct answers ) Contamination of the atmosphere by gaseous,
or solid wastes or byproducts. Emitted from natural or human-made
liquids
sources.
Most of the world's air pollution problems are... ( Correct answers ) Human-
made
Major Pollutants ( Correct answers ) Hydrocarbons (HCs), carbon monoxide (CO),
nitrogen oxides (NOx). (released from fossil fuels like gasoline and
and
diesel)
Hydrocarbons ( Correct answers ) Unburned fuel of any class of organic
composed of carbon and
compounds
hydrogen
Carbon Monoxide ( Correct answers ) Colorless, odorless, and poisonous gas.
when an engine burns HV in the presence of
Created
O2.
, Oxygen ( Correct answers ) Too much or too little can cause improper combustion
and result in pollution
Ozone (Smog) ( Correct answers ) Not emitted directly into the air, it is created at
ground level by a chemical reaction between NOx and HC in the presence of
sunlight .
Nitrogen Oxides (NOx) ( Correct answers ) Excessive amounts can be caused by
lean air-fuel mixture, a defective exhaust gas recirculation valve, higher than
a
engine temperatures, vacuum leaks, and advanced ignition
normal
timing.
Five Gas Theory ( Correct answers ) The relationship between HC, CO, O2, CO2,
and NOx are the same in all gasoline engines.
Stoichiometric Ratio ( Correct answers ) For all engines, a mixture of approx.
parts of air to every one-part of fuel produces the most efficient use of fuel and
14.7
lowest
the
emissions.
Why would hydrocarbon be higher than the stoichiometric ratio? ( Correct
answers ) The mixture is very rich or very lean. Normal combustion is 15:1 air/fuel
ratio.
What happens when there is not enough O2 in an engine? ( Correct answers ) It
runs rich, meaning combustion forms more CO and less CO2.
What does it mean if Hc is high and CO is extremely low? ( Correct answers )
The engine is either very lean or there's a misfire.
What does it mean if CO is very high? ( Correct answers ) The engine is definitely
rich, getting too much fuel or not enough air.
Why is oxygen the best lean indicator? ( Correct answers ) The levels change
during lean mixtures.
Why is oxygen (O2) not a reliable rich indicator? ( Correct answers ) It is
low whenever the mixture is rich. Rich mixtures burn all available O2.
When did PA implement itd first emissions I/M program? ( Correct answers )
1984
In 1990 Congress set the requirements for an enhanced program in the Clean Air
Amendments which aimed to do what? ( Correct answers ) Lower harmful
Act
emissions
and increase accountability at the state
level.
What was the 1992 EPA mandate in accordance with the Clean Air Act?
( Correct ) PA required a vehicle emissions I/M program be implemented to
answers
increase
air quality and decrease
pollution.
