Pack a Day
Chrome extension

Your city's air,
in cigarettes.

Breathing bad air harms you the way smoking does. Pack a Day turns the PM2.5 around you into a number you can feel.

You quit smoking. Your city didn't.

Get the extension How it works ↓
Live demo · real air data
PACK A
DAY
8

Pick a city to start.

How it works

Three taps from your toolbar to a number that reframes your commute.

  1. 01

    Pick your city

    Start typing. It matches cities worldwide, or grabs your location on the first run.

  2. 02

    Set your hours

    Slide from zero to a full day outdoors.

  3. 03

    Open the pack

    The cigarettes that rise out are your dose. The worse the air, the fuller the pack.

The science

A microgram count means little. A cigarette is something everyone understands.

Berkeley Earth found that about 22 µg/m³ of PM2.5 over a day does roughly the same damage as one cigarette, drawn from the mortality work of Pope et al. (2016). Pack a Day runs that conversion on live air data for the city you pick.

The rule of thumb, made literal: cigarettes = (PM2.5 ÷ 22) × (hours ÷ 24) Live air quality from Open-Meteo. A rough gauge for awareness, not medical advice.