San Francesco · Ubora wa hewa

1. Nzuri0–50
2. Wastani51–100Current category
3. Hewa yenye madhara kwa makundi nyeti101–150
4. Hewa yenye madhara151–200
5. Hewa yenye madhara makubwa201–300
6. Hatari301–500+

A higher US AQI indicates more air pollution and greater health concern. Categories and pollutant concentration units are different measures.

Vichafuzi vyote

PM1

4 µg/m³

PM2.5

6 µg/m³

PM10

8 µg/m³

Ozoni

59 µg/m³

Dioksidi ya nitrojeni

4.7 µg/m³

Dioksidi ya salfa

1 µg/m³

Monoksidi ya kaboni

171 µg/m³

European AQI (separate scale)

2