Skip to main content

The Clean Air Sarnia and Area (CASA) monitoring network includes continuous (real-time) and non-continuous air quality monitoring equipment.

Real-Time Monitoring Equipment

Real-time monitoring equipment is employed throughout the CASA network for the following parameters:

NO2 - Nitrogen dioxide is measured using a nitrogen oxides analyzer , which uses the principle of chemiluminescence detection.

O3 - Ozone is measured using a UV adsorption analyzer.

SO2 - Sulphur dioxide is measured using a UV fluorescence analyzer.

TRS - Total reduced sulphur is measured using a UV fluorescence analyzer.

PM2.5 - Fine particulate matter is measured using a SHARP or BAM particulate monitor.

VOC - Volatile organic compounds, specifically 1,3-butadiene and benzene, are measured using a gas chromatograph/mass spectrometer (GC/MS).

Wind Speed/Wind Direction - Wind conditions are measured using an anemometer, which provides information on wind speed and wind direction.

Air Quality Monitoring Equipment

Non-Continuous Monitoring

Non-continuous monitoring involves collecting samples which are sent for laboratory analysis. Non-continuous monitoring equipment is employed throughout the CASA network for the following parameters:

TSP and metals - Total suspended particulate and metals sampling uses a high-volume air sampler that draws air through a sample filter that captures particulate matter containing metals. The sample draws air through the filter for a 24-hour period, and then the filter is analyzed at a laboratory.

VOC - Volatile organic compound samples are collected into a specially prepared evacuated canister (SUMMA canister). The samples collect air over a 24-hour period, and then the canister is sent to a lab for analysis using a Gas Chromatography/ Mass Spectrometer (GC/MS).

PAH - Polycyclic aromatic hydrocarbon samples are collected using a high volume sampler with a Teflon filter. The sampler draws air through the filter for a 24-hour period, and then the filter is sent to a laboratory for analysis using a Gas Chromatograph/ Mass Spectrometry (GC/MS).

SUMMA canister

Working towards improving Sarnia's air quality!