😷 空气污染：看不见的“隐形杀手”😷 Air Pollution: the Invisible Killers
上一片说地球在“发烧”。这天早上，蓝星镇的蓝色星球向导一推窗：天空灰蒙蒙，嗓子发痒——空气里藏着看不见的“隐形杀手”。Last leaf, Earth was “running a fever”. This morning our blue-planet guide opens the window in Blue Planet Town: gray sky, itchy throat — invisible killers are hiding in the air.
第 1 步：认识四个隐形杀手Step 1: Meet the four invisible killers
杀手看不见，但个个有名有姓，先认脸。Invisible, but each has a name — learn their faces first.
老大叫 PM2.5：直径不到头发丝的 1/30，能钻进肺里扎营。老二二氧化硫呛鼻子，老三氮氧化物出自尾气，老四臭氧专在烈日下“发威”。它们越小越能钻，越钻越伤身。The boss is PM2.5: thinner than 1/30 of a hair, small enough to camp inside your lungs. Then comes choking sulfur dioxide (SO₂), tailpipe nitrogen oxides (NOₓ), and ozone that “shows off” on scorching days. The smaller they are, the deeper they sneak — and the more harm they do.
这些杀手从哪来？顺着烟找，就能找到老巢。Where do they come from? Follow the smoke and you'll find their hideouts.
第 2 步：顺着烟找老巢Step 2: Follow the smoke to their hideouts
四股烟最粗：燃煤厂的黑烟、满街汽车的尾气、化工厂的废气、田里焚烧秸秆的浓烟。烟越多，AQI（空气质量指数）越高：50 以下算“优”，超过 150 就该戴口罩了。Four smokes are the thickest: coal-plant black smoke, car exhausts crowding the streets, chemical-plant fumes, and straw-burning smoke from the fields. More smoke, higher AQI (Air Quality Index): below 50 is “good”, above 150 means reach for a mask.
烟一时半会散不掉，我们先保护自己，再慢慢治本。The smoke won't clear today — so protect yourself first, then fix the root causes.
第 3 步：先防护，再治本Step 3: Protect yourself first, fix the roots next
雾霾天出门戴口罩，回家开空气净化器，少在户外久待。治本靠三招：燃煤厂装脱硫除尘、汽车限行加换新能源、秸秆还田不再烧——烟少了，蓝天就回来了。On smoggy days wear a mask outside, run an air purifier at home, and stay out less time. The long-term cures: scrubbers on coal plants, fewer cars plus new-energy vehicles, straw returned to fields instead of burned — less smoke, blue sky back.
🎮 你来当排查员（30 秒）🎮 Your turn: pollution detective (30 seconds)
道理讲完了。先拨 4 个排放开关，看 AQI 怎么变；再接 4 个排查任务，找出元凶、选对治理办法。Theory done. First flip the 4 emission switches and watch the AQI move; then take 4 missions — find the culprit and pick the right fix.
一句话记住它：空气污染 = 隐形杀手（PM2.5 等）＋ 四股烟（燃煤/汽车/工业/秸秆）；看 AQI 行动，戴口罩防护，用清洁办法治本。Remember it in one line: air pollution = invisible killers (PM2.5 and friends) + four smokes (coal / cars / industry / straw); watch the AQI, mask up, and cure it with clean fixes.
四杀手：PM2.5、二氧化硫、氮氧化物、臭氧，越小越能钻进肺Four killers: PM2.5, SO₂, NOₓ, ozone — smaller sneaks deeper into lungs四老巢：燃煤、汽车尾气、工业废气、秸秆焚烧；AQI 越高越脏Four hideouts: coal, car exhaust, factory fumes, straw burning; higher AQI = dirtier防护＋治本：口罩少待；脱硫除尘、限行、新能源、秸秆还田Defend + cure: mask up, stay out less; scrubbers, car limits, new energy, straw back to fields
内容参考 OpenStax 等公开教材，多来源核对 · AI 生成、人工审核 · 发现错误欢迎指正，帮这片叶子长得更好。Based on OpenStax and other open textbooks, cross-checked across sources · AI-generated, human-reviewed · Spotted a mistake? Tell us — help this leaf grow.
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