Air Quality
4.7/5
6.7 µg/m³Good
Air Quality Profile
St. Catharines reports an annual PM2.5 of 6.7 µg/m³. That's close to the WHO 2021 annual guideline (5 µg/m³) and well inside historically healthy ranges.
St. Catharines
Canada
CanadaAnnual Average
GoodWHO annual classification
6.7µg/m³
Jan
Feb
Mar
Apr
May
Jun
Jul
Aug
Sep
Oct
Nov
Dec
PM2.5
6.96.9 µg/m³ — Good
6.96.9 µg/m³ — Good
6.86.8 µg/m³ — Good
6.36.3 µg/m³ — Good
7.97.9 µg/m³ — Good
7.27.2 µg/m³ — Good
7.07.0 µg/m³ — Good
7.17.1 µg/m³ — Good
5.85.8 µg/m³ — Good
5.55.5 µg/m³ — Good
6.76.7 µg/m³ — Good
6.56.5 µg/m³ — Good
Jan
Feb
Mar
Apr
May
Jun
6.96.9 µg/m³ — Good
6.96.9 µg/m³ — Good
6.86.8 µg/m³ — Good
6.36.3 µg/m³ — Good
7.97.9 µg/m³ — Good
7.27.2 µg/m³ — Good
Jul
Aug
Sep
Oct
Nov
Dec
7.07.0 µg/m³ — Good
7.17.1 µg/m³ — Good
5.85.8 µg/m³ — Good
5.55.5 µg/m³ — Good
6.76.7 µg/m³ — Good
6.56.5 µg/m³ — Good
Best months: Apr, Sep–OctWorst months: May–Jun, Aug
Good5–10 µg/m³
Based on WUSTL PM2.5 dataset (2020–2024) · WHO 2021 thresholds
Confidence: ●●●
Air Quality Profile
St. Catharines reports an annual PM2.5 of 6.7 µg/m³. That's close to the WHO 2021 annual guideline (5 µg/m³) and well inside historically healthy ranges.
St. CatharinesCanada
CanadaAnnual Average
GoodWHO annual classification
6.7µg/m³
Jan
Feb
Mar
Apr
May
Jun
Jul
Aug
Sep
Oct
Nov
Dec
PM2.5
6.96.9 µg/m³ — Good
6.96.9 µg/m³ — Good
6.86.8 µg/m³ — Good
6.36.3 µg/m³ — Good
7.97.9 µg/m³ — Good
7.27.2 µg/m³ — Good
7.07.0 µg/m³ — Good
7.17.1 µg/m³ — Good
5.85.8 µg/m³ — Good
5.55.5 µg/m³ — Good
6.76.7 µg/m³ — Good
6.56.5 µg/m³ — Good
Jan
Feb
Mar
Apr
May
Jun
6.96.9 µg/m³ — Good
6.96.9 µg/m³ — Good
6.86.8 µg/m³ — Good
6.36.3 µg/m³ — Good
7.97.9 µg/m³ — Good
7.27.2 µg/m³ — Good
Jul
Aug
Sep
Oct
Nov
Dec
7.07.0 µg/m³ — Good
7.17.1 µg/m³ — Good
5.85.8 µg/m³ — Good
5.55.5 µg/m³ — Good
6.76.7 µg/m³ — Good
6.56.5 µg/m³ — Good
Best months: Apr, Sep–OctWorst months: May–Jun, Aug
Good5–10 µg/m³
Based on WUSTL PM2.5 dataset (2020–2024) · WHO 2021 thresholds
Confidence: ●●●
Who thrives in St. Catharines
Great fit
About St. Catharines
Mobility
▶Public Transit
Insufficient transit-feed data to measure coverage.
Frequently asked about St. Catharines
▶How many sunny days does St. Catharines have per year?
St. Catharines averages approximately 168 sunny days per year, based on historical climate data.
▶What is the air quality in St. Catharines?
St. Catharines has an annual PM2.5 concentration of 6.7 µg/m³, classified as "Good" by WHO standards. Within WHO interim target 4. Low health risk for most people.