Exact-Match PM2.5 Utility

PM2.5 cigarette calculator

If your app, sensor, or monitor already shows PM2.5 in µg/m³, use this page directly. The calculator keeps the PM2.5 number exact, derives the AQI-equivalent band for context, and translates the exposure into cigarette-equivalent framing.

Try PM2.5 12 µg/m³Try PM2.5 35 µg/m³ for 8hTry PM2.5 150 µg/m³

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What this PM2.5 calculator is based on

Review methodology

Review policy

March 2026. We update supporting pages when calculator logic, live data behavior, or source framing changes.

Primary sources

AQI uses EPA / AirNow breakpoint logic. Cigarette-equivalent framing follows Berkeley Earth’s PM2.5 interpretation.

AirNow AQIBerkeley Earth

Live data layer

City pages use EPA AirNow where supported, with cached fallbacks and planning baselines if the API fails or coverage is unavailable.

Why this page exists

AQI is useful for general public reporting, but many air-quality tools surface PM2.5 directly. This page matches that user intent exactly and avoids unnecessary conversion steps.

It is also more transparent for users who want to compare raw particle concentration, AQI-equivalent category, and cigarette-equivalent exposure side by side.

Practical PM2.5 examples

12 µg/m³ for 24h: close to the EPA annual standard level, but still not zero exposure.
35 µg/m³ for 8h: a moderate-to-unhealthy-for-sensitive-groups range that can change exercise and child outdoor plans.
150 µg/m³ for 24h: heavy smoke-day exposure where indoor air management matters as much as outdoor behavior.

PM2.5 calculator FAQ

What PM2.5 level equals one cigarette?

Using the Berkeley Earth framing used on this site, 22 µg/m³ of PM2.5 sustained for 24 hours is roughly equivalent to one cigarette.

Why add PM2.5 mode instead of AQI only?

Many monitors, sensors, and air-quality apps expose PM2.5 directly. PM2.5 mode lets users calculate cigarette-equivalent exposure without converting back from AQI first.

Does PM2.5 mode still show AQI-based guidance?

Yes. The calculator derives an AQI-equivalent band from the PM2.5 value so the same category, scenario guidance, and action checklists still work.