Environmental Monitoring Technologies: Air Quality Assessment

Gravimetric analysis involves collecting PM on a filter and measuring its weight before and after sampling.

Chemiluminescence analyzers measure NO2 by reacting it with ozone (O3) to produce light, which is then detected.

PIDs measure VOCs by ionizing them with ultraviolet light and detecting the resulting ions.

Nephelometers measure the scattering of light by particles in the air, which is used to estimate the concentration of PM.

Continuous monitoring involves collecting and analyzing air samples continuously over time to provide real-time data on air quality.

FIDs measure THC by burning them in a hydrogen flame and detecting the resulting ions.

Electrochemical sensors measure CO by reacting it with an electrolyte to produce an electrical signal.

GC-MS systems are used to separate and identify VOCs in air samples.

Grab sampling involves collecting a single air sample at a specific time and location.

Spectrophotometers measure SO2 by detecting the absorption of ultraviolet light by SO2 molecules.

UV sensors measure O3 by detecting the absorption of ultraviolet light by O3 molecules.

Passive samplers collect air samples over a period of time, which are then analyzed to determine the concentration of pollutants.

Remote sensing involves using sensors mounted on satellites, aircraft, or other platforms to collect air quality data over a large area.

Electrochemical sensors measure CO by reacting it with an electrolyte to produce an electrical signal.