Annual Air Pollutant Statistics for Ontario from 1995

Annual statistics from 1995 onward track six key pollutants: Carbon Monoxide, Oxides of Nitrogen, Ozone, Fine Particulate Matter, Sulphur Dioxide, and Total Reduced Sulphur. The Government of Ontario provides percentile, mean, and maximum values, along with counts of exceedances against provincial air quality criteria. This data supports the annual Air Quality in Ontario Reports, with hourly concentrations available separately.

Use Cases

• Analyzing long-term trends in pollutant concentrations based on annual statistics from 1995 onward
• Evaluating regulatory compliance based on counts of exceedances against Ontario air quality criteria
• Comparing pollutant levels across years based on percentile, mean, and maximum values
• Correlating public health outcomes with annual pollution levels based on tracked pollutants

Strengths

• Data covers six specific pollutants: Carbon Monoxide, Oxides of Nitrogen, Ozone, PM2.5, Sulphur Dioxide, and Total Reduced Sulphur
• Time series spans from 1995 to the current available year, providing a long-term perspective
• Includes multiple statistical measures: percentiles, mean, maximums, and exceedance counts

Limitations

• Column-level documentation is absent; field semantics must be inferred after download
• Row count is unknown, which may limit suitability assessment
• Data may reflect geographic bias inherent to open_canada, focusing solely on Ontario

Provenance

Source

Government of Ontario

Collection Method

Likely collected from air monitoring stations across Ontario.

Time Range

1995 to the current available year

Freshness

Last updated 2026-04-17 15:43:54.334574; freshness should be verified

Geography

Ontario, Canada