Yokosuka Air Quality Forecast - Today, Tomorrow
Air Quality Today
Today (14 October): Air quality in Yokosuka is fair. AQI and O3 are fair; PM2.5, PM10, NO2, SO2, CO, HCHO, and PM1 are good. Pollution peaks around 1:00 AM (O3: 26.0/100).
Air Quality Tomorrow
Tomorrow (15 October 2026): Air quality in Yokosuka is fair. All pollutants stay as today. Pollution peaks around 11:00 PM (O3: 31.3/100).
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Air Quality
Today - 14 October
| Pollutant | Level | Value |
|---|---|---|
| AQI | Fair | 21.7/100 |
| PM2.5 (fine particles) | Good | 9.5/100 |
| PM10 (coarse particles) | Good | 13.9/100 |
| NO2 (nitrogen dioxide) | Good | 0.5/100 |
| O3 (ozone) | Fair | 21.7/100 |
| SO2 (sulfur dioxide) | Good | 0.5/100 |
| CO (carbon monoxide) | Good | 0.5/100 |
| HCHO (formaldehyde) | Good | 1.1/100 |
| PM1 (ultrafine particles) | Good | 1.8/100 |
Tomorrow - 15 October
| Pollutant | Level | Value |
|---|---|---|
| AQI | Fair | 23.5/100 |
| PM2.5 (fine particles) | Good | 9.8/100 |
| PM10 (coarse particles) | Good | 13.8/100 |
| NO2 (nitrogen dioxide) | Good | 0.4/100 |
| O3 (ozone) | Fair | 23.5/100 |
| SO2 (sulfur dioxide) | Good | 0.5/100 |
| CO (carbon monoxide) | Good | 0.5/100 |
| HCHO (formaldehyde) | Good | 1.1/100 |
| PM1 (ultrafine particles) | Good | 2.2/100 |
Local Environmental Conditions
Yokosuka's air quality reflects the Miura Peninsula's Tokyo Bay and Sagami Bay dual-coastal position, with the US Fleet Activities Yokosuka naval base's military vessel and aviation operations generating elevated maritime NOₓ alongside vehicle traffic on surrounding roads. The outstanding dual-bay coastal exposure provides reliable maritime ventilation, while the naval base's maritime industrial character represents the most distinctive local emission source and Yokosuka generally maintains moderate to good Kanagawa coastal readings throughout most of the year.
Air quality in Yokosuka tends to be worse when road traffic, airport and aviation operations, as well as fishing fleet activity build up and windblown dust events occur. Strong seasonal winds can lift dust from the surrounding dry terrain and push particulate levels sharply higher. Sea breezes typically keep conditions in check, except during still weather.
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Frequently Asked Questions About Air Quality in Kanagawa
Is air quality bad in Yokosuka right now?
On 14 October 2026, overall air quality in Yokosuka is fair. AQI is the main air quality indicator at 21.7/100. Pollution peaks around 1:00 AM (O3: 26.0/100).
Will air quality be worse tomorrow in Yokosuka?
On 15 October 2026, air quality conditions in Yokosuka will be similar to today, with AQI forecast at fair at 23.5/100. Pollution peaks around 11:00 PM (O3: 31.3/100).
When is air pollution at its worst in Yokosuka?
Air quality in Yokosuka tends to be worse when road traffic, airport and aviation operations, as well as fishing fleet activity build up and windblown dust events occur. Strong seasonal winds can lift dust from the surrounding dry terrain and push particulate levels sharply higher. Sea breezes typically keep conditions in check, except during still weather.
Are air quality levels in Yokosuka based on measurements or forecasts?
It is forecasts derived by downscaling forecasts provided by EU’s Copernicus Atmosphere Monitoring Service (CAMS) by taking into account local conditions such as traffic patterns. CAMS bases its forecast on satellite measurements of particles and chemical compounds in the atmosphere. Airmine’s services were developed with support from the European Space Agency (ESA)’s Business Applications and Space Solutions (BASS) team.
Why doesn’t the forecast always reflect wildfire impacts?
Airmine’s forecast uses CAMS (Copernicus Atmosphere Monitoring Service) as its background atmospheric model. While CAMS includes wildfire emissions, these are derived from satellite observations and are not available in real time. During rapidly evolving wildfire events, there may therefore be a delay before increased emissions are incorporated into the model. As a result, the forecast may temporarily underestimate PM₂.₅ and other pollutants associated with wildfire smoke.
During rapidly evolving wildfire events, CAMS may lag by approximately 1–2 days before increased wildfire emissions are fully represented, which can lead to temporary underestimation of PM₂.₅ concentrations in Airmine’s forecast.
Understanding the Scale
The 0–100 air quality scores represent risk levels, not direct air pollutant concentrations. Higher scores indicate higher risk.
Air Quality
| Good | 0-20 | Low air quality risk. Air quality is expected to be good, with low levels of pollution. |
| Fair | 20-40 | Generally low air quality risk. Air quality is expected to be acceptable, with some pollution present. |
| Moderate | 40-60 | Moderate air quality risk. Air pollution is elevated and air quality may be less favorable. |
| Poor | 60-80 | High air quality risk. Air pollution is high and air quality is expected to be poor. |
| Very Poor | 80-100 | Very high air quality risk. Air pollution is very high and air quality is expected to be very poor. |