SmogRank / Scales / Canada AQHI+
Canada AQHI+ for PM2.5
Published by Environment and Climate Change Canada with Health Canada. Canada's Air Quality Health Index, read here from PM2.5 alone (AQHI+), which is how it answers wildfire smoke within the hour.
Canada's AQHI+ for PM2.5 (1 point per 10 µg/m³), which is defined on hourly values. Show SmogRank's numbers in Canada AQHI+; you can change it under any chart.
Convert a reading
Set at 6.1 µg/m³, the middle of the 2515 cities on the 24-hour board.
Try 15.0 µg/m³ (the WHO's 24-hour guideline) or 102.6 µg/m³ (eManzimtoti over the last 24 hours).
Its bands
Low risk
AQHI+ 1–3 · up to 30.0 µg/m³
Ideal air for outdoor activity.
Takes in the WHO's 24-hour guideline (15 µg/m³).
Moderate risk
AQHI+ 4–6 · over 30.0 to 60.0 µg/m³
People at risk are advised to think about rescheduling hard outdoor activity if they feel symptoms; usual activity is fine for others.
Over the WHO's 24-hour guideline (15 µg/m³) all the way.
High risk
AQHI+ 7–10 · over 60.0 to 100.0 µg/m³
People at risk, children and older adults are advised to cut or reschedule hard outdoor effort; others to do the same if they feel symptoms.
Over the WHO's 24-hour guideline (15 µg/m³) all the way.
Very high risk
AQHI+ 10+ · over 100.0 µg/m³
People at risk are advised to avoid hard outdoor effort, and everyone else to cut or reschedule it.
Over the WHO's 24-hour guideline (15 µg/m³) all the way.
The meanings above are ours, in short. The publisher's own advice for each band: Environment and Climate Change Canada with Health Canada.
Each scale here is its PM2.5 part only. Official indexes take the worst of several pollutants, so a city's official number can be higher. The scales are defined on 24-hour means (AQHI+ on hourly ones); how we use them.
Other scales
US AQI · India AQI · China AQI · European AQI · UK DAQI. Every scale side by side.
Nothing on SmogRank is medical advice. For health guidance during bad air, follow your local health authority.