Johannesburg, California Air Quality
Johannesburg has a median AQI of 61, earning an air quality grade of C — moderate air quality that ranks better than 3% of US cities. Air quality has been improving steadily over the past decade, a positive sign for residents. Ground-level ozone is the primary concern, typically peaking on warm sunny days due to vehicle and industrial emissions. In 2025, Johannesburg recorded 65 good air quality days (24% of monitored days) and 25 unhealthy days.
Population: 86 • County: Kern
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Quick Facts
| Current AQI | 61 — Moderate |
| Air Quality Grade | C |
| Median AQI (2025) | 61 |
| vs. U.S. Cities | Better than 3% |
| Primary Pollutant | Ozone |
| Unhealthy Days/Year | 25 |
| 10-Year Trend | ↑ Improving |
| Data Source | EPA AirNow |
Health Recommendation
Air quality is acceptable. However, there may be a risk for some people who are unusually sensitive to air pollution.
Unusually sensitive people should consider reducing prolonged or heavy outdoor exertion.
5-Day AQI Forecast
Last 30 Days
Current Pollutant Levels
Real-time data from EPA AirNow
AQI Trend (10 Years)
Air Quality Days by Year
2025 Air Quality Summary
Primary Pollutant Days (2025)
Days when each pollutant was the primary driver of AQI. Learn about pollutants →
Frequently Asked Questions About Johannesburg Air Quality
What is the air quality in Johannesburg today?
The current AQI in Johannesburg is 61, which is rated "Moderate". Air quality is acceptable. However, there may be a risk for some people who are unusually sensitive to air pollution.
Is air quality in Johannesburg getting better or worse?
Air quality in Johannesburg has been improving over the past decade. The median AQI dropped from 80 in 2016 to 61 in 2025.
What is the most common air pollutant in Johannesburg?
Ozone is the primary air pollutant in Johannesburg, responsible for the most air quality-impacted days in 2025. Ground-level ozone forms when sunlight reacts with vehicle and industrial emissions on warm days.
How many unhealthy air days does Johannesburg have per year?
In 2025, Johannesburg had 25 days when air quality was unhealthy or unhealthy for sensitive groups (AQI above 100). There were 65 good days and 183 moderate days out of 273 days monitored.
What air quality grade does Johannesburg receive?
Johannesburg receives an air quality grade of C, placing it better than 3% of US cities. This grade is based on a median AQI of 61 for 2025, derived from EPA monitoring data.
Air Quality Grade
Better than 3% of US cities
Nearby Cities
Protect Your Health
With a median AQI of 61, indoor air purification is recommended
See Recommended Purifiers ↓Get AQI Alerts
Receive notifications when air quality changes in Johannesburg
National Rankings
See how Johannesburg compares to every other US city by air quality.
Most Polluted Cities →All city rankingsRecommended Air Purifiers for Johannesburg
Based on your area's air quality (median AQI: 61), we recommend these air purifiers to help protect your health indoors.
Honeywell HPA300
Powerful workhorse for large rooms. Built to last.
- ✓Perfect room size match
- ✓Recommended for your air quality
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Other Great Options
Blueair Blue Pure 211+
High performance for large rooms with simple operation.
RabbitAir MinusA2
Stylish wall-mountable design with customizable artwork panels.
Molekule Air Pro
Commercial-grade with patented PECO technology for destroying pollutants.
Not sure which air purifier is right for you?
Learn more about different types of air purifiers and how to choose the best one for your needs.
Read our complete buying guide →