Downtown
29000 · Lower city — downtown · Elgin St. / Kelly St.
8.2 µg/m³ annual average
Days below the WHO 24-hour guideline
89%
of valid days, July 2025 – June 2026
Elevated periods
21
runs of days with a daily average of 15 µg/m³ or more
Highest daily average
64 µg/m³
Jul 14 2025 · Downtown
Annual average, by station
7.6–8.2 µg/m³
below Canada’s 8.8 · above WHO’s 5
Where the readings come from
Two networks measure fine particles in Hamilton and they are kept separate on this page: the province’s three stations feed the chart hour by hour; the industry network publishes checked annual figures for the north and east ends, once a year.
Provincial stations — Air Quality Ontario · hourly · on the chart
West
29118 · West end · Main St. W. / Hwy 403
7.7 µg/m³ annual average
Mountain
29214 · Central Mountain · 250 Fennell Ave. W.
7.6 µg/m³ annual average
Industry network — HAMN · calendar 2025 annual report · not on the chart
Annual means transcribed from HAMN’s published, quality-assured 2025 report. HAMN does not publish a republishable hourly or daily series, and its calendar-year window differs from the chart’s, so these figures are listed here rather than drawn. Read them side by side with the provincial annual averages, not with the daily line.
Wentworth North
29667 · North end · Wentworth St. N. (north end)
9 µg/m³ · 2025 mean
Burlington / Gage
29180 · East-central · Burlington St. E. / Gage Ave. N.
10 µg/m³ · 2025 mean
Parkdale
29153 · East end · Parkdale Ave. N.
11 µg/m³ · 2025 mean
Christopher Park
29168 · East end · McAnulty Blvd. area (east end)
10 µg/m³ · 2025 mean
Beach Blvd
29102 · Beach strip · Beach Blvd. (beach strip)
11 µg/m³ · 2025 mean
No public PM2.5 monitor
Not covered by any public monitor
- Stoney Creek — HAMN’s Millen Rd station closed in 2012; its GFL-facility station reports no PM2.5
- Dundas — no provincial or industry monitor
- Ancaster — no provincial or industry monitor
- Flamborough — no provincial or industry monitor
- Glanbrook — no provincial or industry monitor
Day by day
Daily averages at the three provincial stations. Scroll or pinch to zoom; zoom in past three weeks to see hour-by-hour readings. The dotted line is the WHO 24-hour guideline (15), the dashed line Canada’s 24-hour standard (27).
Amber dots mark the three labelled elevated periods. Gaps are days a station reported fewer than 18 of 24 hours.
Only the province’s three stations publish daily readings. Stoney Creek has had no fine-particle monitor since HAMN’s Millen Road station closed in 2012; Dundas, Ancaster, Flamborough and Glanbrook have never had one.
Elevated periods
Each card is a run of days on which the highest station’s daily average reached the WHO 24-hour guideline of 15 µg/m³. Select a card to zoom the chart to it.
What the office asked the Board for
Three practical steps the Health & Safety office has put to the Board.
MERV 13 filter check at downtown schools
Confirm which downtown schools’ ventilation systems are fitted with MERV 13 filters.
Baseline indoor and outdoor readings
Take paired indoor and outdoor PM2.5 readings on an ordinary day, so that readings taken during a smoke event have a baseline to be compared with.
Redeploy the pandemic-era HEPA units
Bring the portable HEPA air cleaners bought during the pandemic back into classrooms.