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Pollutants
Select Pollutant
Ozone (O3)
Fine Particulate Matter (PM2.5)
Nitrogen Dioxide (NO2)
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Day
1
2
3
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5
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7
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9
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11
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20
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2025
Chart
Table
Guelph: Hourly Fine Particulate Matter Readings
From Jan-19-2025 EST to Jan-21-2025 EST.
Jan-19-2025 EST
Jan-20-2025 EST
Jan-21-2025 EST
