This document discusses air quality and monitoring instruments. It introduces air pollutants as hazardous substances emitted from primary sources like particulates, SO2, and CO or formed as secondary pollutants through atmospheric reactions producing ozone, acid rain, and photochemical smog. Air pollution is monitored using manual methods like passive sampling or instrumental methods such as Non-Dispersive Infra-Red, Chemiluminescence, Flame Photometric Analysers, and Fluorescence monitors.

1. AIR QUALITY
MEASURING INSTRUMENT

2. INTRODUCTION
Air pollutants are both hazardous substances and substances which
undergo chemical reactions in the atmosphere to produce hazardous
substances.
SOURCES OF AIR POLLUTION
Primary pollutants
Secondary Pollutants

3. Primary pollutants Secondary pollutants
 Particulates
 Sulphur dioxide, SO2
 Carbon monoxide, CO
 The oxides of nitrogen, Nox
 Benzene
 Hydrogen sulphide, H2S
 Fluorides
 Ozone (O3) and photochemical
smog
 Acid rain

4. AIR POLLUTION MONITORING DEVICES
Divided into two category-
- Manual methods
-Instrumental Monitoring Methods

5. MANUAL METHODS
- Passive sample

6. Paper tape samplers

7. Instrumental Monitoring Methods
-Non-Dispersive Infra-Red (NDIR)
-Chemiluminescence
-Flame Photometric Analysers
-Fluorescence Monitors
-Suspended Particulate Monitoring Methods

8. • Non-Dispersive Infra-Red (NDIR) • Chemiluminescence

9. • Flame Photometric Analysers • Fluorescence Monitors