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Vehicles , factories , and power plants still release more than 150 million tons of pollutants into the air each year .
TQA:T_0456_5
8
release
true
release
[ "what", "_", "_", "releases", "something", "_", "_", "?" ]
[ "Vehicles , factories , and power plants" ]
[ [ 0, 7 ] ]
Vehicles , factories , and power plants still release more than 150 million tons of pollutants into the air each year .
TQA:T_0456_5
8
release
true
release
[ "when", "does", "something", "release", "something", "_", "_", "?" ]
[ "each year", "each year ." ]
[ [ 19, 21 ], [ 19, 22 ] ]
Vehicles , factories , and power plants still release more than 150 million tons of pollutants into the air each year .
TQA:T_0456_5
8
release
true
release
[ "where", "does", "something", "release", "something", "_", "_", "?" ]
[ "into the air" ]
[ [ 16, 19 ] ]
They are known as primary pollutants and secondary pollutants .
TQA:T_0457_1
2
known
true
know
[ "what", "is", "someone", "known", "_", "as", "_", "?" ]
[ "primary pollutants and secondary pollutants" ]
[ [ 4, 9 ] ]
They are known as primary pollutants and secondary pollutants .
TQA:T_0457_1
2
known
true
know
[ "who", "is", "_", "known", "_", "as", "something", "?" ]
[ "They" ]
[ [ 0, 1 ] ]
Primary pollutants enter the air directly .
TQA:T_0458_0
2
enter
true
enter
[ "how", "is", "something", "entering", "something", "_", "_", "?" ]
[ "directly", "directly ." ]
[ [ 5, 6 ], [ 5, 7 ] ]
Primary pollutants enter the air directly .
TQA:T_0458_0
2
enter
true
enter
[ "what", "is", "_", "entering", "something", "_", "_", "?" ]
[ "Primary pollutants", "pollutants" ]
[ [ 0, 2 ], [ 1, 2 ] ]
Primary pollutants enter the air directly .
TQA:T_0458_0
2
enter
true
enter
[ "what", "is", "something", "entering", "_", "_", "_", "?" ]
[ "air", "the air" ]
[ [ 4, 5 ], [ 3, 5 ] ]
Some are released by natural processes , like ash from volcanoes .
TQA:T_0458_1
2
released
true
release
[ "how", "is", "something", "released", "_", "_", "_", "?" ]
[ "by natural processes , like ash from volcanoes", "by natural processes" ]
[ [ 3, 11 ], [ 3, 6 ] ]
Some are released by natural processes , like ash from volcanoes .
TQA:T_0458_1
2
released
true
release
[ "what", "is", "_", "released", "_", "_", "_", "?" ]
[ "Some" ]
[ [ 0, 1 ] ]
Sulfur oxides include sulfur dioxide -LRB- SO2 -RRB- and sulfur trioxide -LRB- SO3 -RRB- .
TQA:T_0458_10
2
include
true
include
[ "what", "does", "something", "include", "_", "_", "_", "?" ]
[ "sulfur dioxide -LRB- SO2 -RRB- and sulfur trioxide -LRB- SO3 -RRB-", "sulfur dioxide -LRB- SO2 -RRB- and sulfur trioxide" ]
[ [ 3, 14 ], [ 3, 11 ] ]
Sulfur oxides include sulfur dioxide -LRB- SO2 -RRB- and sulfur trioxide -LRB- SO3 -RRB- .
TQA:T_0458_10
2
include
true
include
[ "what", "_", "_", "includes", "something", "_", "_", "?" ]
[ "Sulfur oxides" ]
[ [ 0, 2 ] ]
Sulfur oxides are produced when sulfur and oxygen combine .
TQA:T_0458_11
3
produced
true
produce
[ "what", "is", "_", "produced", "_", "_", "_", "?" ]
[ "Sulfur oxides" ]
[ [ 0, 2 ] ]
Sulfur oxides are produced when sulfur and oxygen combine .
TQA:T_0458_11
3
produced
true
produce
[ "when", "is", "something", "produced", "_", "_", "_", "?" ]
[ "when sulfur and oxygen combine", "sulfur and oxygen combine" ]
[ [ 4, 9 ], [ 5, 9 ] ]
Sulfur oxides are produced when sulfur and oxygen combine .
TQA:T_0458_11
8
combine
true
combine
[ "what", "_", "_", "combines", "_", "_", "_", "?" ]
[ "sulfur", "oxygen", "sulfur and oxygen" ]
[ [ 5, 6 ], [ 7, 8 ], [ 5, 8 ] ]
This happens when coal burns .
TQA:T_0458_12
1
happens
true
happen
[ "what", "_", "_", "happens", "_", "_", "_", "?" ]
[ "This" ]
[ [ 0, 1 ] ]
This happens when coal burns .
TQA:T_0458_12
1
happens
true
happen
[ "when", "does", "something", "happen", "_", "_", "_", "?" ]
[ "when coal burns", "coal burns" ]
[ [ 2, 5 ], [ 3, 5 ] ]
Coal can contain up to 10 percent sulfur .
TQA:T_0458_13
2
contain
true
contain
[ "what", "_", "_", "contains", "something", "_", "_", "?" ]
[ "Coal" ]
[ [ 0, 1 ] ]
Coal can contain up to 10 percent sulfur .
TQA:T_0458_13
2
contain
true
contain
[ "what", "does", "something", "contain", "_", "_", "_", "?" ]
[ "up to 10 percent sulfur", "sulfur" ]
[ [ 3, 8 ], [ 7, 8 ] ]
Toxic heavy metals include mercury and lead .
TQA:T_0458_14
3
include
true
include
[ "what", "does", "something", "include", "_", "_", "_", "?" ]
[ "lead", "mercury", "mercury and lead", "mercury and lead ." ]
[ [ 6, 7 ], [ 4, 5 ], [ 4, 7 ], [ 4, 8 ] ]
Toxic heavy metals include mercury and lead .
TQA:T_0458_14
3
include
true
include
[ "what", "_", "_", "includes", "something", "_", "_", "?" ]
[ "Toxic heavy metals" ]
[ [ 0, 3 ] ]
Mercury is used in some industrial processes .
TQA:T_0458_15
2
used
true
use
[ "what", "is", "_", "used", "_", "_", "_", "?" ]
[ "Mercury" ]
[ [ 0, 1 ] ]
Mercury is used in some industrial processes .
TQA:T_0458_15
2
used
true
use
[ "when", "is", "something", "used", "_", "_", "_", "?" ]
[ "in some industrial processes" ]
[ [ 3, 7 ] ]
It is also found in fluorescent light bulbs .
TQA:T_0458_16
3
found
true
find
[ "what", "is", "_", "found", "_", "_", "somewhere", "?" ]
[ "It" ]
[ [ 0, 1 ] ]
It is also found in fluorescent light bulbs .
TQA:T_0458_16
3
found
true
find
[ "where", "is", "something", "found", "_", "_", "_", "?" ]
[ "in fluorescent light bulbs" ]
[ [ 4, 8 ] ]
Lead was once widely used in gasoline , paint , and pipes .
TQA:T_0458_17
4
used
true
use
[ "what", "was", "_", "used", "_", "_", "_", "?" ]
[ "Lead" ]
[ [ 0, 1 ] ]
Lead was once widely used in gasoline , paint , and pipes .
TQA:T_0458_17
4
used
true
use
[ "what", "was", "something", "used", "_", "in", "_", "?" ]
[ "gasoline , paint , and pipes" ]
[ [ 6, 12 ] ]
It is still found in some products .
TQA:T_0458_18
3
found
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find
[ "what", "is", "_", "found", "_", "in", "something", "?" ]
[ "It" ]
[ [ 0, 1 ] ]
It is still found in some products .
TQA:T_0458_18
3
found
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find
[ "what", "is", "something", "found", "_", "in", "_", "?" ]
[ "in some products", "some products" ]
[ [ 4, 7 ], [ 5, 7 ] ]
It is still found in some products .
TQA:T_0458_18
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found
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find
[ "when", "is", "something", "found", "_", "in", "something", "?" ]
[ "still" ]
[ [ 2, 3 ] ]
Most are released by human activities .
TQA:T_0458_2
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released
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release
[ "how", "is", "something", "released", "_", "_", "_", "?" ]
[ "human activities", "by human activities" ]
[ [ 4, 6 ], [ 3, 6 ] ]
VOCs are released in many human activities , such as raising livestock .
TQA:T_0458_20
2
released
true
release
[ "what", "_", "_", "released", "_", "_", "_", "?" ]
[ "VOCs" ]
[ [ 0, 1 ] ]
VOCs are released in many human activities , such as raising livestock .
TQA:T_0458_20
2
released
true
release
[ "when", "did", "something", "release", "_", "_", "_", "?" ]
[ "in many human activities" ]
[ [ 3, 7 ] ]
VOCs are released in many human activities , such as raising livestock .
TQA:T_0458_20
10
raising
true
raise
[ "what", "is", "_", "raised", "_", "_", "_", "?" ]
[ "livestock", "VOCs" ]
[ [ 11, 12 ], [ 0, 1 ] ]
VOCs are released in many human activities , such as raising livestock .
TQA:T_0458_20
10
raising
true
raise
[ "who", "is", "_", "raising", "_", "_", "_", "?" ]
[ "livestock", "human" ]
[ [ 11, 12 ], [ 5, 6 ] ]
Livestock wastes produce a lot of methane .
TQA:T_0458_21
2
produce
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produce
[ "what", "does", "something", "produce", "_", "_", "_", "?" ]
[ "a lot of methane" ]
[ [ 3, 7 ] ]
Livestock wastes produce a lot of methane .
TQA:T_0458_21
2
produce
true
produce
[ "what", "_", "_", "produces", "something", "_", "_", "?" ]
[ "Livestock", "Livestock wastes" ]
[ [ 0, 1 ], [ 0, 2 ] ]
Many are released when fossil fuels burn -LRB- see Figure 22.1 -RRB- .
TQA:T_0458_24
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released
true
release
[ "what", "is", "_", "released", "_", "_", "_", "?" ]
[ "Many" ]
[ [ 0, 1 ] ]
Many are released when fossil fuels burn -LRB- see Figure 22.1 -RRB- .
TQA:T_0458_24
2
released
true
release
[ "when", "is", "something", "released", "_", "_", "_", "?" ]
[ "when fossil fuels burn" ]
[ [ 3, 7 ] ]
Many are released when fossil fuels burn -LRB- see Figure 22.1 -RRB- .
TQA:T_0458_24
6
burn
true
burn
[ "what", "is", "_", "burned", "_", "_", "_", "?" ]
[ "fossil fuels" ]
[ [ 4, 6 ] ]
Many are released when fossil fuels burn -LRB- see Figure 22.1 -RRB- .
TQA:T_0458_24
8
see
true
see
[ "where", "can", "someone", "see", "_", "_", "_", "?" ]
[ "Figure 22.1" ]
[ [ 9, 11 ] ]
They pour into the air from vehicles and smokestacks .
TQA:T_0458_3
1
pour
true
pour
[ "what", "does", "something", "pour", "_", "into", "_", "?" ]
[ "air from vehicles and smokestacks", "the air from vehicles and smokestacks", "the air" ]
[ [ 4, 9 ], [ 3, 9 ], [ 3, 5 ] ]
They pour into the air from vehicles and smokestacks .
TQA:T_0458_3
1
pour
true
pour
[ "what", "_", "_", "pours", "_", "into", "something", "?" ]
[ "They" ]
[ [ 0, 1 ] ]
Several of these pollutants are described below .
TQA:T_0458_4
5
described
true
describe
[ "what", "is", "_", "described", "_", "_", "_", "?" ]
[ "Several of these pollutants", "pollutants" ]
[ [ 0, 4 ], [ 3, 4 ] ]
Several of these pollutants are described below .
TQA:T_0458_4
5
described
true
describe
[ "where", "is", "something", "described", "_", "_", "_", "?" ]
[ "below" ]
[ [ 6, 7 ] ]
Carbon oxides include carbon monoxide -LRB- CO -RRB- and carbon dioxide -LRB- CO2 -RRB- .
TQA:T_0458_5
2
include
true
include
[ "what", "is", "_", "included", "_", "_", "_", "?" ]
[ "carbon dioxide", "carbon monoxide -LRB- CO -RRB- and carbon dioxide -LRB- CO2 -RRB-", "CO -RRB- and carbon dioxide -LRB- CO2 -RRB-", "carbon monoxide" ]
[ [ 9, 11 ], [ 3, 14 ], [ 6, 14 ], [ 3, 5 ] ]
Carbon oxides include carbon monoxide -LRB- CO -RRB- and carbon dioxide -LRB- CO2 -RRB- .
TQA:T_0458_5
2
include
true
include
[ "where", "is", "something", "included", "_", "_", "_", "?" ]
[ "Carbon oxides" ]
[ [ 0, 2 ] ]
Carbon oxides are released when fossil fuels burn .
TQA:T_0458_6
3
released
true
release
[ "what", "is", "_", "released", "_", "_", "_", "?" ]
[ "Carbon oxides" ]
[ [ 0, 2 ] ]
Carbon oxides are released when fossil fuels burn .
TQA:T_0458_6
3
released
true
release
[ "when", "is", "something", "released", "_", "_", "_", "?" ]
[ "when fossil fuels burn" ]
[ [ 4, 8 ] ]
Carbon oxides are released when fossil fuels burn .
TQA:T_0458_6
7
burn
true
burn
[ "what", "_", "_", "burns", "_", "_", "_", "?" ]
[ "fossil fuels" ]
[ [ 5, 7 ] ]
Nitrogen oxides include nitric oxide -LRB- NO -RRB- and nitrogen dioxide -LRB- NO2 -RRB- .
TQA:T_0458_7
2
include
true
include
[ "what", "is", "_", "including", "something", "_", "_", "?" ]
[ "Nitrogen oxides" ]
[ [ 0, 2 ] ]
Nitrogen oxides include nitric oxide -LRB- NO -RRB- and nitrogen dioxide -LRB- NO2 -RRB- .
TQA:T_0458_7
2
include
true
include
[ "what", "is", "something", "including", "_", "_", "_", "?" ]
[ "nitric oxide -LRB- NO -RRB- and nitrogen dioxide -LRB- NO2 -RRB-", "nitric oxide -LRB- NO -RRB- and nitrogen dioxide -LRB- NO2 -RRB- ." ]
[ [ 3, 14 ], [ 3, 15 ] ]
Nitrogen oxides form when nitrogen and oxygen combine at high temperatures .
TQA:T_0458_8
2
form
true
form
[ "what", "_", "_", "forms", "_", "_", "_", "?" ]
[ "Nitrogen oxides" ]
[ [ 0, 2 ] ]
Nitrogen oxides form when nitrogen and oxygen combine at high temperatures .
TQA:T_0458_8
2
form
true
form
[ "when", "does", "something", "form", "_", "_", "_", "?" ]
[ "when nitrogen and oxygen combine at high temperatures" ]
[ [ 3, 11 ] ]
Nitrogen oxides form when nitrogen and oxygen combine at high temperatures .
TQA:T_0458_8
7
combine
true
combine
[ "what", "_", "_", "combines", "_", "_", "_", "?" ]
[ "oxygen", "nitrogen", "nitrogen and oxygen" ]
[ [ 6, 7 ], [ 4, 5 ], [ 4, 7 ] ]
Nitrogen oxides form when nitrogen and oxygen combine at high temperatures .
TQA:T_0458_8
7
combine
true
combine
[ "what", "is", "something", "combined", "_", "for", "_", "?" ]
[ "Nitrogen oxides" ]
[ [ 0, 2 ] ]
Nitrogen oxides form when nitrogen and oxygen combine at high temperatures .
TQA:T_0458_8
7
combine
true
combine
[ "when", "does", "something", "combine", "_", "_", "_", "?" ]
[ "high temperatures", "at high temperatures" ]
[ [ 9, 11 ], [ 8, 11 ] ]
This occurs in hot exhausts from vehicles , factories , and power plants .
TQA:T_0458_9
1
occurs
true
occur
[ "what", "_", "_", "occurs", "_", "_", "_", "?" ]
[ "This" ]
[ [ 0, 1 ] ]
This occurs in hot exhausts from vehicles , factories , and power plants .
TQA:T_0458_9
1
occurs
true
occur
[ "where", "does", "something", "occur", "_", "_", "_", "?" ]
[ "in hot exhausts from vehicles , factories , and power plants" ]
[ [ 2, 13 ] ]
Secondary pollutants form when primary pollutants undergo chemical reactions after they are released .
TQA:T_0459_0
2
form
true
form
[ "what", "_", "_", "forms", "_", "_", "_", "?" ]
[ "Secondary pollutants" ]
[ [ 0, 2 ] ]
Secondary pollutants form when primary pollutants undergo chemical reactions after they are released .
TQA:T_0459_0
2
form
true
form
[ "when", "does", "something", "form", "_", "_", "_", "?" ]
[ "when primary pollutants undergo chemical reactions after they are released", "primary pollutants undergo chemical reactions after they are released" ]
[ [ 3, 13 ], [ 4, 13 ] ]
Secondary pollutants form when primary pollutants undergo chemical reactions after they are released .
TQA:T_0459_0
6
undergo
true
undergo
[ "what", "does", "something", "undergo", "_", "after", "something", "?" ]
[ "chemical reactions" ]
[ [ 7, 9 ] ]
Secondary pollutants form when primary pollutants undergo chemical reactions after they are released .
TQA:T_0459_0
6
undergo
true
undergo
[ "what", "does", "something", "undergo", "something", "after", "_", "?" ]
[ "they are released" ]
[ [ 10, 13 ] ]
Secondary pollutants form when primary pollutants undergo chemical reactions after they are released .
TQA:T_0459_0
6
undergo
true
undergo
[ "what", "_", "_", "undergoes", "something", "after", "something", "?" ]
[ "primary pollutants" ]
[ [ 4, 6 ] ]
Secondary pollutants form when primary pollutants undergo chemical reactions after they are released .
TQA:T_0459_0
12
released
true
release
[ "what", "is", "_", "released", "_", "_", "_", "?" ]
[ "primary pollutants", "Secondary pollutants", "they" ]
[ [ 4, 6 ], [ 0, 2 ], [ 10, 11 ] ]
Many occur as part of photochemical smog .
TQA:T_0459_1
1
occur
true
occur
[ "what", "does", "something", "occur", "_", "as", "_", "?" ]
[ "part of photochemical smog" ]
[ [ 3, 7 ] ]
The oxygen atoms combine with molecules of oxygen to form ozone .
TQA:T_0459_10
3
combine
true
combine
[ "what", "_", "_", "combines", "_", "_", "_", "?" ]
[ "The oxygen atoms" ]
[ [ 0, 3 ] ]
The oxygen atoms combine with molecules of oxygen to form ozone .
TQA:T_0459_10
3
combine
true
combine
[ "what", "does", "something", "combine", "_", "with", "_", "?" ]
[ "molecules of oxygen" ]
[ [ 5, 8 ] ]
The oxygen atoms combine with molecules of oxygen to form ozone .
TQA:T_0459_10
3
combine
true
combine
[ "why", "does", "something", "combine", "_", "with", "something", "?" ]
[ "to form ozone" ]
[ [ 8, 11 ] ]
The oxygen atoms combine with molecules of oxygen to form ozone .
TQA:T_0459_10
9
form
true
form
[ "how", "does", "something", "form", "_", "_", "_", "?" ]
[ "The oxygen atoms combine with molecules of oxygen", "combine" ]
[ [ 0, 8 ], [ 3, 4 ] ]
The oxygen atoms combine with molecules of oxygen to form ozone .
TQA:T_0459_10
9
form
true
form
[ "what", "does", "something", "form", "_", "_", "_", "?" ]
[ "ozone" ]
[ [ 10, 11 ] ]
Smog ozone is harmful to humans and other living things .
TQA:T_0459_11
8
living
true
live
[ "what", "is", "_", "living", "_", "_", "_", "?" ]
[ "things" ]
[ [ 9, 10 ] ]
This type of smog is seen as a brown haze in the air .
TQA:T_0459_2
5
seen
true
see
[ "what", "is", "_", "seen", "_", "_", "_", "?" ]
[ "This type of smog", "smog" ]
[ [ 0, 4 ], [ 3, 4 ] ]
This type of smog is seen as a brown haze in the air .
TQA:T_0459_2
5
seen
true
see
[ "what", "is", "something", "seen", "_", "as", "_", "?" ]
[ "a brown haze in the air" ]
[ [ 7, 13 ] ]
Photochemical smog forms when certain pollutants react together in the presence of sunlight .
TQA:T_0459_3
6
react
true
react
[ "what", "_", "_", "reacts", "_", "_", "_", "?" ]
[ "certain pollutants", "pollutants" ]
[ [ 4, 6 ], [ 5, 6 ] ]
Photochemical smog forms when certain pollutants react together in the presence of sunlight .
TQA:T_0459_3
6
react
true
react
[ "when", "does", "something", "react", "_", "_", "_", "?" ]
[ "in the presence of sunlight", "together in the presence of sunlight" ]
[ [ 8, 13 ], [ 7, 13 ] ]
You can see smog hanging in the air over San Francisco in Figure 22.2 .
TQA:T_0459_4
2
see
true
see
[ "how", "can", "someone", "see", "something", "_", "_", "?" ]
[ "hanging" ]
[ [ 4, 5 ] ]
You can see smog hanging in the air over San Francisco in Figure 22.2 .
TQA:T_0459_4
2
see
true
see
[ "what", "can", "someone", "see", "_", "_", "somewhere", "?" ]
[ "smog" ]
[ [ 3, 4 ] ]
You can see smog hanging in the air over San Francisco in Figure 22.2 .
TQA:T_0459_4
2
see
true
see
[ "where", "can", "someone", "see", "something", "_", "_", "?" ]
[ "in Figure 22.2", "in the air over San Francisco", "in the air" ]
[ [ 11, 14 ], [ 5, 11 ], [ 5, 8 ] ]
You can see smog hanging in the air over San Francisco in Figure 22.2 .
TQA:T_0459_4
2
see
true
see
[ "who", "can", "_", "see", "something", "_", "somewhere", "?" ]
[ "You" ]
[ [ 0, 1 ] ]
Photochemical smog consists mainly of ozone -LRB- O3 -RRB- .
TQA:T_0459_5
2
consists
true
consist
[ "what", "_", "_", "consists", "_", "of", "something", "?" ]
[ "Photochemical smog" ]
[ [ 0, 2 ] ]
Photochemical smog consists mainly of ozone -LRB- O3 -RRB- .
TQA:T_0459_5
2
consists
true
consist
[ "what", "does", "something", "consist", "_", "of", "_", "?" ]
[ "-LRB- O3 -RRB-", "mainly of ozone -LRB- O3 -RRB-", "mainly of ozone" ]
[ [ 6, 9 ], [ 3, 9 ], [ 3, 6 ] ]
But ozone in smog is found near the ground .
TQA:T_0459_7
5
found
true
find
[ "what", "is", "_", "found", "_", "_", "somewhere", "?" ]
[ "ozone in smog" ]
[ [ 1, 4 ] ]
But ozone in smog is found near the ground .
TQA:T_0459_7
5
found
true
find
[ "where", "is", "something", "found", "_", "_", "_", "?" ]
[ "near the ground" ]
[ [ 6, 9 ] ]
Figure 22.3 shows how it forms .
TQA:T_0459_8
5
forms
true
form
[ "what", "_", "_", "forms", "_", "_", "somewhere", "?" ]
[ "it" ]
[ [ 4, 5 ] ]
Figure 22.3 shows how it forms .
TQA:T_0459_8
5
forms
true
form
[ "where", "does", "something", "form", "_", "in", "_", "?" ]
[ "Figure 22.3" ]
[ [ 0, 2 ] ]
When nitrogen oxides and VOCs are heated by the Sun , they lose oxygen atoms .
TQA:T_0459_9
6
heated
true
heat
[ "what", "is", "_", "heated", "_", "by", "something", "?" ]
[ "VOCs", "nitrogen oxides", "nitrogen oxides and VOCs" ]
[ [ 4, 5 ], [ 1, 3 ], [ 1, 5 ] ]
When nitrogen oxides and VOCs are heated by the Sun , they lose oxygen atoms .
TQA:T_0459_9
6
heated
true
heat
[ "what", "is", "something", "heated", "_", "by", "_", "?" ]
[ "Sun", "the Sun" ]
[ [ 9, 10 ], [ 8, 10 ] ]
When nitrogen oxides and VOCs are heated by the Sun , they lose oxygen atoms .
TQA:T_0459_9
12
lose
true
lose
[ "what", "does", "something", "lose", "_", "_", "_", "?" ]
[ "oxygen atoms" ]
[ [ 13, 15 ] ]
When nitrogen oxides and VOCs are heated by the Sun , they lose oxygen atoms .
TQA:T_0459_9
12
lose
true
lose
[ "what", "_", "_", "loses", "something", "_", "_", "?" ]
[ "they", "nitrogen oxides and VOCs" ]
[ [ 11, 12 ], [ 1, 5 ] ]
When nitrogen oxides and VOCs are heated by the Sun , they lose oxygen atoms .
TQA:T_0459_9
12
lose
true
lose
[ "when", "does", "something", "lose", "something", "_", "_", "?" ]
[ "When nitrogen oxides and VOCs are heated by the Sun", "heated by the Sun" ]
[ [ 0, 10 ], [ 6, 10 ] ]
Most pollutants enter the air when fossil fuels burn .
TQA:T_0460_0
2
enter
true
enter
[ "what", "does", "something", "enter", "_", "_", "_", "?" ]
[ "air", "the air" ]
[ [ 4, 5 ], [ 3, 5 ] ]
Most pollutants enter the air when fossil fuels burn .
TQA:T_0460_0
2
enter
true
enter
[ "what", "_", "_", "enters", "something", "_", "_", "?" ]
[ "Most pollutants", "pollutants" ]
[ [ 0, 2 ], [ 1, 2 ] ]
Most pollutants enter the air when fossil fuels burn .
TQA:T_0460_0
2
enter
true
enter
[ "when", "does", "something", "enter", "something", "_", "_", "?" ]
[ "when fossil fuels burn", "fossil fuels burn" ]
[ [ 5, 9 ], [ 6, 9 ] ]
Most pollutants enter the air when fossil fuels burn .
TQA:T_0460_0
8
burn
true
burn
[ "what", "_", "_", "burns", "_", "_", "_", "?" ]
[ "fossil fuels" ]
[ [ 6, 8 ] ]
Some are released when forests burn .
TQA:T_0460_1
2
released
true
release
[ "what", "is", "_", "released", "_", "_", "_", "?" ]
[ "Some", "Some are" ]
[ [ 0, 1 ], [ 0, 2 ] ]
Some are released when forests burn .
TQA:T_0460_1
2
released
true
release
[ "when", "is", "something", "released", "_", "_", "_", "?" ]
[ "forests burn", "when forests burn" ]
[ [ 4, 6 ], [ 3, 6 ] ]
Some are released when forests burn .
TQA:T_0460_1
5
burn
true
burn
[ "what", "is", "_", "burning", "_", "_", "_", "?" ]
[ "forests" ]
[ [ 4, 5 ] ]
Others evaporate into the air .
TQA:T_0460_2
1
evaporate
true
evaporate
[ "where", "does", "something", "evaporate", "_", "_", "_", "?" ]
[ "into the air" ]
[ [ 2, 5 ] ]
Burning fossil fuels releases many pollutants into the air .
TQA:T_0461_0
3
releases
true
release
[ "what", "does", "something", "release", "_", "into", "something", "?" ]
[ "many pollutants", "pollutants" ]
[ [ 4, 6 ], [ 5, 6 ] ]