英検1級・地表オゾンとオゾン層は何が違う？【WHO・UNEP】独自24例・4択12問

結論：英検1級でオゾンを説明する場合、上空のオゾン層が紫外線を吸収する役割と、地表オゾンが光化学スモッグの成分となることを混同しないのが重要です。WHO・UNEPの一次情報を参考に慶英会が独自24の誤文修正例・4択12問・全解答・重要語彙20表現を作成しました。科学的な表現の正確さを読解・英作文・面接で再利用できる無料教材です。

一次情報：WHO｜Ambient (Outdoor) Air Pollution（2024年10月24日）、UNEP｜About Montreal Protocol。前者は地表オゾン、後者はオゾン層破壊物質と成層圏オゾン層保護を説明する資料です。英検協会の1級試験内容を使い、公式過去問との区別も確認してください。

まず成層圏と地表付近のオゾンを比較する

比較	Stratospheric ozone	Ground-level ozone
位置	成層圏	地表付近
主要な議論	紫外線の吸収・保護	大気汚染・光化学スモッグ
政策の対象	オゾン層破壊物質の制御など	適切な大気汚染の削減・監視
誤解	全てのオゾンが良い	全てのオゾンが悪い

慶英会の独自24修正例｜誤った英語を根拠のある説明へ

各例は英語の文法よりも、科学的な概念・原因・範囲の誤読に着目しています。正しい言い方は一つに限られません。

高度・役割｜独自6例

修正1

不適切：Ozone is always either good or bad.

改善：The effects and functions of ozone depend on where it is present.

解説：オゾンの位置と役割を分ける。

修正2

不適切：The ozone layer is the smog that people breathe near the road.

改善：The protective ozone layer is in the upper atmosphere, unlike near-surface smog.

解説：成層圏と地表を混同しない。

修正3

不適切：All stratospheric ozone should be removed to improve health.

改善：Stratospheric ozone helps protect life by absorbing harmful ultraviolet radiation.

解説：上空の保護作用を正しく表す。

修正4

不適切：All ozone near the ground protects people from ultraviolet light.

改善：Ground-level ozone is a constituent of photochemical smog and requires separate air-quality consideration.

解説：地表の汚染と上空の保護は異なる。

修正5

不適切：Ozone cannot exist at two different atmospheric heights.

改善：Ozone can be present in different parts of the atmosphere with different implications.

解説：同じO3でも存在する高度に注意。

修正6

不適切：Reducing ground-level ozone means destroying the ozone layer.

改善：Controlling ground-level pollution and protecting stratospheric ozone are distinct, compatible objectives.

解説：対策が同じ意味ではない。

地表オゾンの形成｜独自6例

修正7

不適切：Ground-level ozone is emitted directly by one car and nothing else.

改善：Ground-level ozone can form through reactions involving other gases in sunlight.

解説：二次生成を確認。

修正8

不適切：Sunlight cannot affect ozone production.

改善：Sunlight contributes to chemical reactions that can form near-surface ozone.

解説：日光と化学反応の関係。

修正9

不適切：Nitrogen oxides and volatile organic compounds never influence ozone.

改善：Nitrogen oxides and volatile organic compounds can act as precursors in ozone formation.

解説：前駆物質の役割。

修正10

不適切：The most crowded road must always have the highest ozone level.

改善：Ozone concentrations depend on chemistry, timing, weather and air movement.

解説：排出場所と生成場所は必ずしも一致しない。

修正11

不適切：One sunny afternoon proves a city’s annual ozone level.

改善：One afternoon’s measurement cannot establish a city’s entire annual pattern.

解説：観測の期間を区別。

修正12

不適切：A change in ozone concentration has exactly one cause.

改善：Atmospheric conditions and different precursor sources may influence ozone concentrations.

解説：一要因へ断定しない。

数字と測定｜独自6例

修正13

不適切：A daily average represents every hour.

改善：An average can conceal changes across hours.

解説：平均値の時間的限界。

修正14

不適切：One monitoring station describes every neighborhood.

改善：Different neighborhoods may have different conditions and measurement needs.

解説：観測地点の代表性。

修正15

不適切：An ozone alert proves everyone has identical exposure.

改善：An alert signals relevant conditions but does not establish equal individual exposure.

解説：警報と個人の実際の曝露は別。

修正16

不適切：Measured improvement means all pollutants disappeared.

改善：A favorable ozone trend does not prove that every air pollutant has been eliminated.

解説：汚染物質ごとの区別。

修正17

不適切：An online forecast is a guarantee of exact future concentration.

改善：A forecast involves assumptions and uncertainty.

解説：予報と確定値を区別。

修正18

不適切：The number of public messages proves everyone understands them.

改善：Message delivery does not establish accurate public comprehension.

解説：配信量と理解は別。

WHO・UNEPと政策｜独自6例

修正19

不適切：WHO says the upper-atmosphere ozone layer is the same as ground-level pollution.

改善：WHO distinguishes ground-level ozone from the protective ozone layer in the upper atmosphere.

解説：WHOの説明と一致させる。

修正20

不適切：The Montreal Protocol was designed to eliminate every molecule of ozone.

改善：The Montreal Protocol controls ozone-depleting substances to protect the stratospheric ozone layer.

解説：条約の対象はオゾンそのものの排除ではない。

修正21

不適切：Montreal Protocol success proves urban photochemical smog is gone.

改善：Progress on ozone-depleting substances does not establish that all urban ground-level ozone pollution has ended.

解説：別の指標を混同しない。

修正22

不適切：Air-quality education replaces emission-control measures.

改善：Clear education can complement appropriate pollution monitoring and control.

解説：情報伝達と実際の対策は補完。

修正23

不適切：The color of a smog warning identifies all affected individuals.

改善：Warnings need relevant context about the pollutant, time and location.

解説：表示だけで個人の状況を確定しない。

修正24

不適切：A local campaign can permanently control every global atmospheric process.

改善：Local policies should address appropriate sources while recognizing broader atmospheric influences.

解説：地域対策と全球の現象を区別。

独自4択12問｜WHO・UNEPの考え方を正しく読む

Question 1

Which ozone is associated with the protective absorption of ultraviolet radiation?

• (A) Ground-level smog
• (B) Stratospheric ozone
• (C) Carbon monoxide
• (D) Nitrogen dioxide

Question 2

Which statement is correct about ground-level ozone?

• (A) It can be a constituent of photochemical smog.
• (B) It is always harmless.
• (C) It is identical to the entire stratospheric ozone layer.
• (D) It cannot form in sunlight.

Question 3

Which term describes chemicals that contribute to ozone formation?

• (A) Irrelevant gases
• (B) Liquid freshwaters
• (C) Ozone precursors
• (D) Submarine cables

Question 4

Which conclusion follows from one city’s improving ozone average?

• (A) All residents have the same exposure.
• (B) Every other air pollutant is eliminated.
• (C) Every hour had identical conditions.
• (D) The reported measure may have improved, but further context is needed.

Question 5

What does the Montreal Protocol target?

• (A) Every molecule of ozone
• (B) Ozone-depleting substances
• (C) All vehicle engines
• (D) All rainstorms

Question 6

Why is one roadside monitor insufficient for universal claims?

• (A) One location may not represent all times and neighborhoods.
• (B) Every measurement is fraudulent.
• (C) Ozone cannot be observed.
• (D) Every road has identical chemistry.

Question 7

Which process contributes to ground-level ozone?

• (A) Only deep-sea currents
• (B) Only groundwater recharge
• (C) Atmospheric reactions involving precursor gases and sunlight
• (D) Only direct release of ozone from phone batteries

Question 8

Which claim is an unsupported overgeneralization?

• (A) Ozone may be present at different altitudes.
• (B) Stratospheric ozone absorbs UV.
• (C) Ground-level ozone can contribute to smog.
• (D) A single ozone alert proves every resident faces identical exposure.

Question 9

What distinguishes a forecast from an observed concentration?

• (A) A forecast gives a prediction, while observation describes a measurement.
• (B) Both are guaranteed to be identical.
• (C) Forecasts can never be issued.
• (D) Observation is always a guess.

Question 10

What is the most suitable public message?

• (A) All ozone is beneficial.
• (B) Protecting the ozone layer and controlling ground-level pollution address different issues.
• (C) All ozone is harmful everywhere.
• (D) No measurement is useful.

Question 11

What does a high page-view count establish?

• (A) That all readers understand ozone chemistry.
• (B) That ozone pollution is eliminated.
• (C) That many page views occurred, not necessarily correct comprehension.
• (D) That stratospheric ozone is destroyed.

Question 12

What should policy makers evaluate?

• (A) Only campaign logo colors.
• (B) Only the number of press releases.
• (C) Only whether every neighborhood is sunny.
• (D) Relevant pollutant measurements, understandable communication and practical outcomes.

4択12問の全解答・根拠

Q1 正解（B）Stratospheric ozone。保護的な働きは成層圏オゾンに関する説明。

Q2 正解（A）It can be a constituent of photochemical smog.。WHOの屋外大気汚染資料による説明。

Q3 正解（C）Ozone precursors。NOxやVOCなどが前駆物質。

Q4 正解（D）The reported measure may have improved, but further context is needed.。平均の解釈範囲を守る。

Q5 正解（B）Ozone-depleting substances。成層圏オゾン層を破壊する物質が対象。

Q6 正解（A）One location may not represent all times and neighborhoods.。地理と時間の代表性。

Q7 正解（C）Atmospheric reactions involving precursor gases and sunlight。二次生成の仕組み。

Q8 正解（D）A single ozone alert proves every resident faces identical exposure.。警報が示す範囲を越えている。

Q9 正解（A）A forecast gives a prediction, while observation describes a measurement.。予測と観測の違い。

Q10 正解（B）Protecting the ozone layer and controlling ground-level pollution address different issues.。二つの目的は矛盾しない。

Q11 正解（C）That many page views occurred, not necessarily correct comprehension.。閲覧と理解の違い。

Q12 正解（D）Relevant pollutant measurements, understandable communication and practical outcomes.。実務上の成果を重視。

オゾンと大気の重要英語20表現

英語	日本語
ground-level ozone	地表オゾン
stratospheric ozone	成層圏オゾン
ozone layer	オゾン層
ultraviolet radiation	紫外線
photochemical smog	光化学スモッグ
precursor gas	前駆ガス
nitrogen oxides	窒素酸化物
volatile organic compound	揮発性有機化合物
atmospheric reaction	大気中の反応
secondary pollutant	二次汚染物質
exposure	曝露
pollutant concentration	汚染物質濃度
ozone depletion	オゾン層破壊
Montreal Protocol	モントリオール議定書
measurement period	測定期間
monitoring station	測定局
forecast uncertainty	予報の不確実性
air-quality guidance	大気質に関する案内
public comprehension	一般の理解
environmental policy	環境政策

二次面接で答えられる独自8問と回答

Interview Q1

Question: Should governments control ground-level ozone?

Model answer: Yes. Relevant monitoring and pollution control can support public health, while policies must consider local conditions.

Interview Q2

Question: Is ozone always harmful?

Model answer: No. Stratospheric ozone plays a protective role, whereas ground-level ozone can be a pollutant.

Interview Q3

Question: Why is scientific education necessary?

Model answer: People may confuse two different atmospheric issues and misunderstand public warnings.

Interview Q4

Question: Can one pollution measure describe every neighborhood?

Model answer: Not automatically. Conditions vary with location, weather and the time observed.

Interview Q5

Question: Should governments protect the ozone layer?

Model answer: Yes. The Montreal Protocol addresses ozone-depleting substances and related international cooperation.

Interview Q6

Question: Does reducing ground-level ozone conflict with protecting the ozone layer?

Model answer: No. Those objectives concern different atmospheric contexts.

Interview Q7

Question: What is a limitation of ozone forecasts?

Model answer: A forecast describes possible conditions but is not a guarantee of exact concentrations everywhere.

Interview Q8

Question: How would you judge an information campaign?

Model answer: I would assess meaningful understanding and practical usefulness rather than count website visits alone.

英作文で使える6文

• Ozone’s role depends on its atmospheric location.
• Stratospheric ozone can help protect organisms against harmful UV radiation.
• Ground-level ozone can be an air pollutant.
• Precursor gases and sunlight contribute to ozone formation.
• A citywide concentration does not describe every hour or neighborhood.
• Accurate communication can help avoid confused or exaggerated claims.

7日間の復習方法

• 1日目：WHOとUNEPの公式情報で2つのオゾンの違いを確認。
• 2日目：修正1〜6で高度と役割。
• 3日目：修正7〜12で地表での生成。
• 4日目：修正13〜18で観測と数字。
• 5日目：修正19〜24でWHO・UNEPの政策。
• 6日目：独自4択12問と面接8問に挑戦。
• 7日目：英検1級公式の別題材で科学的な断定の強さを検証。

FAQ

オゾンは体に良いものですか、悪いものですか？

どこに存在するか、どのような形で曝露されるかによって役割・影響が異なります。

地表のオゾンを減らすことはオゾン層破壊ですか？

地表の大気汚染対策と成層圏のオゾン層保護は異なる課題です。

地表オゾンは車から直接出る物質だけですか？

WHOは日光の存在下で関連するガスが反応して形成される光化学スモッグの成分として説明しています。

参考公式情報・関連教材

• WHO｜Outdoor Air Pollution
• UNEP｜Montreal Protocol
• 英検協会｜1級試験形式
• PM2.5とNO₂の大気汚染4技能教材
• 英検1級総合教材ガイド

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