Port Saint John Air Quality Forecast - Today, Tomorrow
Air Quality Today
Today (6 October): Air quality in Port Saint John is very poor. AQI and PM10 are very poor; PM2.5 is moderate; NO2, O3, SO2, CO, HCHO, and PM1 are good. Pollution peaks around 10:00 PM (PM10: 96.4/100).
Air Quality Tomorrow
Tomorrow (7 October 2026): Air quality in Port Saint John is very poor. All pollutants stay as today. Pollution peaks around 8:00 AM (PM10: 100/100).
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Air Quality
Today - 6 October
| Pollen species | Level | Value |
|---|---|---|
| AQI | Very poor | 96.4/100 |
| PM2.5 (fine particles) | Moderate | 52.5/100 |
| PM10 (coarse particles) | Very poor | 96.4/100 |
| NO2 (nitrogen dioxide) | Good | 3.3/100 |
| O3 (ozone) | Good | 18.4/100 |
| SO2 (sulfur dioxide) | Good | 1.4/100 |
| CO (carbon monoxide) | Good | 0.4/100 |
| HCHO (formaldehyde) | Good | 0.8/100 |
| PM1 (ultrafine particles) | Good | 5.1/100 |
Tomorrow - 7 October
| Pollen species | Level | Value |
|---|---|---|
| AQI | Very poor | 100/100 |
| PM2.5 (fine particles) | Moderate | 51.1/100 |
| PM10 (coarse particles) | Very poor | 100/100 |
| NO2 (nitrogen dioxide) | Good | 1.3/100 |
| O3 (ozone) | Good | 15.2/100 |
| SO2 (sulfur dioxide) | Good | 1.5/100 |
| CO (carbon monoxide) | Good | 0.4/100 |
| HCHO (formaldehyde) | Good | 0.9/100 |
| PM1 (ultrafine particles) | Good | 5.2/100 |
Local Environmental Conditions
The center of Port Saint John combines built-up streets with more open land, so local traffic matters, though emissions are less concentrated than in a city center. Woodland in the area offers some natural filtering of particles from traffic. Winds here are fairly strong, averaging around 15 km/h, which helps disperse local pollution. Air arriving from elsewhere in the region adds to what is produced locally.
Ozone is the main concern from February to December, when sunny days averaging 29°C turn traffic and other emissions into ozone by mid-afternoon. From December to February, cooler nights and lighter winds, with temperatures around 18°C, let traffic pollution linger near busy roads. On the plus side, stronger winds around April, about 20 km/h on average, usually bring some of the cleanest air of the year.
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Frequently Asked Questions About Air Quality in Florida
Is air quality bad in Port Saint John right now?
On 6 October 2026, overall air quality in Port Saint John is very poor. AQI is the main air quality indicator at 96.4/100. Pollution peaks around 10:00 PM (PM10: 96.4/100).
Will air quality be worse tomorrow in Port Saint John?
On 7 October 2026, air quality conditions in Port Saint John will be similar to today, with AQI forecast at very poor at 100/100. Pollution peaks around 8:00 AM (PM10: 100/100).
When is air pollution at its worst in Port Saint John?
Ozone is the main concern from February to December, when sunny days averaging 29°C turn traffic and other emissions into ozone by mid-afternoon. From December to February, cooler nights and lighter winds, with temperatures around 18°C, let traffic pollution linger near busy roads. On the plus side, stronger winds around April, about 20 km/h on average, usually bring some of the cleanest air of the year.
Are air quality levels in Port Saint John 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. |