PA Emissions Inspection Comprehensive Resource To Help
You Ace 2026-2027 Exams Includes Frequently Tested
Questions With ELABORATED 100%
Correct COMPLETE SOLUTIONS
Guaranteed Pass First Attempt!! Current Update
1. What health problems can pollution cause? - Correct Answer:
Respiratory issues
2. What percent of air pollution is caused by vehicles? - Correct Answer:
20%
3. How much less air pollution do we have now than in the 1960s? (%) -
Correct Answer: 98% less
4. What is the average thermal efficiency? (%) - Correct Answer: 20%
5. Where does 80% of the rest of the fuel go to? - Correct Answer:
Friction, heat, and emissions
6. What are the 5 major pollutants? - Correct Answer: Hydrocarbons (HC),
Carbon monoxide (CO), Oxides of nitrogen (NOx), Sulfur dioxide (SO2), and
particulate matter
,7. What are hydrocarbons? - Correct Answer: Unburned fuel of carbon
and hydrogen
8. What are hydrocarbons emitted through? - Correct Answer: Incomplete
combustion and fuel evaporation
9. What are hydrocarbons caused by? - Correct Answer: Misfire, rich,
ignition timing, engine deficiencies, and fuel injectors
10.What has lowered hydrocarbons? - Correct Answer: OBD 2, component
controls, fuel delivery, ignition, emissions system, and EVAPs
11.Can you see or smell carbon monoxide? - Correct Answer: No
12.Is carbon monoxide harmful or nonharmful? - Correct Answer: Harmful
13.How is carbon monoxide made? - Correct Answer: Incomplete burning
of fuel
14.What is carbon monoxide caused by?` - Correct Answer: rich, dirty air
filter, fuel injectors, high fuel pressure, defective sensors, plugged PCV
valve, heat riser valve stuck open, air pump malfunction, oil diluted with gas
15.How is nitrogen oxide made? - Correct Answer: Combustion of fuel at
high temperatures
, 16.What is nitrogen oxide the cause of? - Correct Answer: Acid rain
17.What type of health issues does nitrogen oxide cause? - Correct
Answer: Respiratory issues
18.What is nitrogen oxide caused by? - Correct Answer: lean, defective
EGR, high temperature, vacuum leaks, advance ignition timing
19.What can too little or too much oxygen cause? - Correct Answer:
Improper combustion
20.What is too little oxygen caused by? - Correct Answer: rich, dirty air
filter, fuel injectors, high fuel pressure, defective sensors, restricted PCV
valve, EVAP purges at idle
21.What is too much oxygen caused by? - Correct Answer: lean, misfire,
vacuum leak, exhaust leak
22.Where is ozone/smog made at? - Correct Answer: Ground level
23.What creates smog? - Correct Answer: Oxides of nitrogen and
hydrocarbons mixed together in the sunlight
24.What health issue can smog cause? - Correct Answer: Damaged lungs
You Ace 2026-2027 Exams Includes Frequently Tested
Questions With ELABORATED 100%
Correct COMPLETE SOLUTIONS
Guaranteed Pass First Attempt!! Current Update
1. What health problems can pollution cause? - Correct Answer:
Respiratory issues
2. What percent of air pollution is caused by vehicles? - Correct Answer:
20%
3. How much less air pollution do we have now than in the 1960s? (%) -
Correct Answer: 98% less
4. What is the average thermal efficiency? (%) - Correct Answer: 20%
5. Where does 80% of the rest of the fuel go to? - Correct Answer:
Friction, heat, and emissions
6. What are the 5 major pollutants? - Correct Answer: Hydrocarbons (HC),
Carbon monoxide (CO), Oxides of nitrogen (NOx), Sulfur dioxide (SO2), and
particulate matter
,7. What are hydrocarbons? - Correct Answer: Unburned fuel of carbon
and hydrogen
8. What are hydrocarbons emitted through? - Correct Answer: Incomplete
combustion and fuel evaporation
9. What are hydrocarbons caused by? - Correct Answer: Misfire, rich,
ignition timing, engine deficiencies, and fuel injectors
10.What has lowered hydrocarbons? - Correct Answer: OBD 2, component
controls, fuel delivery, ignition, emissions system, and EVAPs
11.Can you see or smell carbon monoxide? - Correct Answer: No
12.Is carbon monoxide harmful or nonharmful? - Correct Answer: Harmful
13.How is carbon monoxide made? - Correct Answer: Incomplete burning
of fuel
14.What is carbon monoxide caused by?` - Correct Answer: rich, dirty air
filter, fuel injectors, high fuel pressure, defective sensors, plugged PCV
valve, heat riser valve stuck open, air pump malfunction, oil diluted with gas
15.How is nitrogen oxide made? - Correct Answer: Combustion of fuel at
high temperatures
, 16.What is nitrogen oxide the cause of? - Correct Answer: Acid rain
17.What type of health issues does nitrogen oxide cause? - Correct
Answer: Respiratory issues
18.What is nitrogen oxide caused by? - Correct Answer: lean, defective
EGR, high temperature, vacuum leaks, advance ignition timing
19.What can too little or too much oxygen cause? - Correct Answer:
Improper combustion
20.What is too little oxygen caused by? - Correct Answer: rich, dirty air
filter, fuel injectors, high fuel pressure, defective sensors, restricted PCV
valve, EVAP purges at idle
21.What is too much oxygen caused by? - Correct Answer: lean, misfire,
vacuum leak, exhaust leak
22.Where is ozone/smog made at? - Correct Answer: Ground level
23.What creates smog? - Correct Answer: Oxides of nitrogen and
hydrocarbons mixed together in the sunlight
24.What health issue can smog cause? - Correct Answer: Damaged lungs
