Hamilton Central Mountain Weather
AQI Forecast Maps:
Air Quality Forecast Maps
Today Forecast Map
Hover over each region for the AQI forecast
Map Courtesy of Air Quality Ontario
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| Very good | Good | Moderate | Poor | Very poor |
| 1 - 15 | 16 - 31 | 32 - 49 | 50 - 99 | 100+ |
The Air Quality Index (AQI) is an indicator of air quality, based on hourly pollutant measurements of some or all of the six most common air pollutants: sulphur dioxide, ozone, nitrogen dioxide, total reduced sulphur compounds, carbon monoxide and fine particulate matter.
Here's what the readings mean:
- If the air quality value is below 32, the air quality is considered relatively good.
- If the AQI value is in the range of 32 to 49 (moderate category), there may be some adverse effects on very sensitive people.
- An index value in the 50 to 99 range (poor category), may have some short-term adverse effects on the human or animal populations, or may cause significant damage to vegetation and property.
- An AQI value of 100 or more (very poor category) may cause adverse effects on a large proportion of those exposed.
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