Air quality
Air quality in Columbus today
Updated
Good (US AQI 40) Air quality is satisfactory and poses little or no risk; a good time for outdoor activity. Model estimate for Sun, Oct 25, 9:00 pm (01:00 UTC).
Live AQI, PM2.5, PM10 and ozone for Columbus, Ohio, United States, with a 48-hour forecast and the best time to be outside.
- US AQI now
- 40 Good
- PM2.5
- 18 µg/m³ 1.2× WHO 24-h guideline
- PM10
- 18 µg/m³
- Ozone
- 36 µg/m³
- Dominant pollutant
- ozone sub-index 40
- Best hour tomorrow
- 6:00 am AQI 50
- European AQI
- 50
Air quality in Columbus right now
Right now the modelled US Air Quality Index for Columbus, Ohio, United States is 40, which falls in the "Good" band (up to 50). Air quality is satisfactory and poses little or no risk; a good time for outdoor activity.
The index is driven mainly by ozone, whose own sub-index is 40. Ozone usually peaks in the afternoon on sunny days and falls back after sunset.
PM2.5 is 18 µg/m³, 1.2 times the WHO 24-hour guideline of 15 µg/m³; PM10 is 18 µg/m³ against a guideline of 45; ozone is 36 µg/m³ (below the WHO 8-hour level of 100); nitrogen dioxide is 43 µg/m³ (above the 24-hour guideline of 25).
Also this hour: carbon monoxide 570 µg/m³.
NASA FIRMS shows 93 fire hotspots within 300 km in the last day (nearest about 69 km), but particle levels are not elevated enough to point to smoke right now.
Columbus AQI forecast: next 48 hours
Over the next 24 hours the AQI is forecast to range from 37 around Sun 10:00 pm to 58 around Mon 8:00 pm, from "Good" at best to "Moderate" at worst.
The following day is expected to be worse, averaging about 66 against 50 for the next 24 hours.
| Local time (America/New_York) | US AQI | Category | PM2.5 µg/m³ | PM10 µg/m³ | Ozone µg/m³ |
|---|---|---|---|---|---|
| Sun 9:00 pm | 40 | Good | 17.9 | 18 | 36 |
| Mon 12:00 am | 42 | Good | 17.8 | 18 | 28 |
| Mon 3:00 am | 48 | Good | 11.9 | 13 | 40 |
| Mon 6:00 am | 50 | Good | 12 | 13 | 34 |
| Mon 9:00 am | 52 | Moderate | 16.9 | 18 | 28 |
| Mon 12:00 pm | 54 | Moderate | 8.9 | 9 | 72 |
| Mon 3:00 pm | 55 | Moderate | 9.5 | 10 | 128 |
| Mon 6:00 pm | 57 | Moderate | 11.2 | 11 | 108 |
| Mon 9:00 pm | 58 | Moderate | 27.6 | 28 | 41 |
| Tue 12:00 am | 61 | Moderate | 32.1 | 32 | 23 |
| Tue 3:00 am | 64 | Moderate | 24.6 | 25 | 36 |
| Tue 6:00 am | 67 | Moderate | 21 | 21 | 38 |
| Tue 9:00 am | 69 | Moderate | 16.8 | 17 | 36 |
| Tue 12:00 pm | 69 | Moderate | 8.4 | 9 | 60 |
| Tue 3:00 pm | 69 | Moderate | 8.7 | 9 | 101 |
| Tue 6:00 pm | 68 | Moderate | 10.8 | 11 | 92 |
| Tue 9:00 pm | 68 | Moderate | 13.7 | 14 | 51 |
Every third hour of the CAMS forecast via Open-Meteo. US AQI uses rolling averages (24 h for particles, 8 h for ozone), so it moves more slowly than the hourly concentrations.
Best time to be outside in Columbus tomorrow
Between 6 am and 9 pm local time, the cleanest air tomorrow is forecast around 6:00 am (AQI 50, Good) and the worst around 8:00 pm (AQI 58). The difference across the day is small, so timing matters little.
Columbus vs the rest of United States
Across 619 United States cities we track, the average US AQI right now is 53 (Moderate). Columbus at 40 is 13 points cleaner than average.
It ranks 89 of 619 from cleanest to most polluted; the cleanest is Hilo (21) and the most polluted Springfield, PA (133).
For context, the median across 3,556 cities worldwide is 58.
Air quality in cities near Columbus
| City | Distance | US AQI | Category | PM2.5 µg/m³ |
|---|---|---|---|---|
| Dublin, OH | 18 km | 39 | Good | 15.4 |
| Delaware | 38 km | 52 | Moderate | 15.1 |
| Lancaster, OH | 44 km | 44 | Good | 6.2 |
| Newark, OH | 52 km | 42 | Good | 9.2 |
| Springfield, OH | 69 km | 53 | Moderate | 14.5 |
| Marion, OH | 71 km | 52 | Moderate | 15.1 |
| Mansfield, OH | 98 km | 44 | Good | 8.3 |
| Dayton | 104 km | 45 | Good | 14.2 |
Model vs measured
We found no measured PM2.5 sensor cell within 25 km of Columbus, so the numbers on this page are model estimates. Models capture regional pollution well but can miss very local sources such as a busy road or a nearby fire.
Advice for sensitive groups
With the AQI at 40, there is no need for sensitive groups to change plans. People with asthma should still carry their reliever inhaler as usual.
What the US AQI numbers mean
| US AQI | Category | What it means |
|---|---|---|
| 0-50 | Good | Air quality is satisfactory and poses little or no risk; a good time for outdoor activity. |
| 51-100 | Moderate | Acceptable for most people. Unusually sensitive people should consider shortening long or heavy exertion outdoors. |
| 101-150 | Unhealthy for Sensitive Groups | People with heart or lung disease, older adults, children and teens should cut back on prolonged or heavy exertion outdoors. |
| 151-200 | Unhealthy | Everyone should reduce prolonged or heavy exertion outdoors; sensitive groups should avoid it and keep windows closed. |
| 201-300 | Very Unhealthy | Health alert: everyone should avoid prolonged or heavy exertion outdoors, and sensitive groups should stay indoors. |
| 301-500 | Hazardous | Emergency conditions: everyone should avoid all outdoor physical activity and stay indoors with filtered air if possible. The scale tops out at 500; heavier dust or smoke is shown as 500. |
Values on this page are modelled by CAMS (Copernicus) and served by Open-Meteo; they are estimates for the area around the city centre, not readings from an official monitor.
Nearby cities
More for Columbus
Air quality elsewhere
Data: Open-Meteo Air Quality API, Copernicus Atmosphere Monitoring Service (CAMS), NASA FIRMS.