Air monitoring. Air pollution. Pollutant types. Installations for air monitoring презентация

in such quantities and of such duration as is or tends to be injurious to human health, animal or plant life, or property.

(homes, factories, offices)

pollutants, which are emitted directly from identifiable sources, and
(2) secondary pollutants, which are produced in the atmosphere
when certain chemical reactions take place among primary pollutants.

organic compounds (VOCs),
carbon monoxide, and
lead.

Air pollution in urban and industrial areas is often called
smog.
 Photochemical smog, a noxious mixture of gases and
particles, is produced when strong sunlight triggers
photochemical reactions in the atmosphere.
 The major component of photochemical smog is ozone.

of
standards for four of the primary pollutants—
 particulates,
 sulfur dioxide,
 carbon monoxide, and
 nitrogen
 as well as the secondary pollutant ozone.

result of a drastic increase in the output of pollutants; instead, they occur because of changes in certain atmospheric conditions.

geometric height of the source (h)
• stack diameter at the source exit (d)
• gas velocity at the source exit (v)
• gas temperature (T)
• stack localization in the geographical
coordinate system (x, y)

garages, under different climate conditions
- Slater Street, Ottawa

VOC, PM2.5, and carbonyl compounds

on the interaction of the gas molecules with light.

Absorbtion techniques – it is measured the intensity of light after passing through a gaseous medium. Usually absorption is measured at several frequencies in order to avoid offests and interferences with other species. There are 4 principles:
Differential Optical Absorption Spectroscopy (DOAS)
Fourier Transform Infrared (FTIR)
Non-Dispersive Infrared (NDIR)
Tunable Laser Diode Absorption Spectroscopy (TLDAS)

==> NO2+ O2 + hv (0.6 – 3 μm)

Chemiluminescent reaction

particles + gas

PM)