科学素养与生活应用·英语30篇（2）

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空气质量监测仪如何探测看不见的污染物

Portable air monitors use laser scattering sensors to count and size airborne particles like PM2.5 and dust.
Electrochemical cells measure gases such as carbon monoxide, nitrogen dioxide, and ozone in real time.
VOC sensors detect volatile organic compounds from paints, cleaners, or furniture off-gassing.
Calibration against reference instruments ensures accuracy, though consumer-grade devices vary in precision.
Real-time data helps users identify pollution spikes—for example, during cooking, cleaning, or wildfire season.
Apps display trends over hours or days, suggesting ventilation timing or air purifier adjustments.
Indoor monitors differ from outdoor ones—they prioritize health-relevant metrics rather than regulatory compliance.
Understanding local readings empowers people to make informed choices about windows, masks, or activity timing.