How many cigarettes is bad air quality equal to?

Using the Berkeley Earth formula, PM2.5 of 22 mcg/m3 for 24 hours equals 1 cigarette. At PM2.5 of 110 mcg/m3 that is about 5 cigarettes per day.

How is the cigarette equivalent calculated?

The Berkeley Earth formula divides PM2.5 in mcg/m3 by 22 to get cigarettes per 24 hours of exposure.

Is the calculator free?

Yes, completely free with no account required.

What PM2.5 level is dangerous?

WHO guidelines set the annual PM2.5 limit at 5 mcg/m3. Above 55 mcg/m3 is Unhealthy and above 150 mcg/m3 is Very Unhealthy.

Cigarette Equivalent Calculator - Air Pollution vs Cigarettes

🚬 Cigarette Equivalent Calculator

PM2.5 Concentration (μg/m³)

Find your live PM2.5 on the AQI homepage

Hours Outdoors Per Day

Activity Level

Days Per Week Outdoors

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per day

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cigarettes/week

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cigarettes/month

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cigarettes/year

Where you fall on the exposure scale

05101520+

📚 How Is This Calculated?

The baseline formula from Berkeley Earth equates breathing 24 hours of air at PM2.5 = 22 μg/m³ to smoking one cigarette in terms of particulate intake. This calculator adjusts for your actual hours outdoors and activity level — during exercise you inhale 2 to 4 times more air per minute, increasing particle intake proportionally.

Formula: Cigarettes/day = (PM2.5 ÷ 22) × (hours outdoors ÷ 24) × activity multiplier

This represents particle mass intake only. Cigarette smoke also contains nicotine, carbon monoxide, and thousands of additional chemicals not found in outdoor air. The comparison is an intuitive benchmark, not a direct medical equivalence.

❓ Frequently Asked Questions

Is breathing polluted air really as bad as smoking?

In terms of PM2.5 particulate mass delivered to the lungs, the comparison can be meaningful at high pollution levels. However, cigarette smoke contains thousands of additional toxic compounds not present in outdoor air pollution. The cigarette equivalent is a communication tool, not a precise medical comparison.

Why does activity level matter?

You breathe roughly 6 to 8 litres of air per minute at rest, but 60 to 100 litres per minute during intense exercise. Running in polluted air dramatically increases the total particle intake, which is why exercising on high-AQI days is particularly harmful even for healthy adults.

What PM2.5 level equals one cigarette per day?

At full 24-hour outdoor exposure with light activity: 22 μg/m³. For a typical 8-hour outdoor day at light activity: approximately 66 μg/m³. For a 2-hour exercise session at moderate intensity: approximately 66 to 88 μg/m³.

Does indoor air contain PM2.5 too?

Yes. Indoor PM2.5 is typically 50 to 70 percent of outdoor levels in modern sealed buildings, and can be higher near busy roads, during cooking, or with gas appliances. This calculator focuses on outdoor exposure only.

Which cities have the highest cigarette equivalents?

Delhi, Lahore, Dhaka, and Kathmandu regularly record 8 to 15 cigarettes per day during winter pollution episodes. Compare any two cities in real time using our Compare Two Cities AQI tool.