Pollution can be measured in several ways.
By the use of spectroscopic methods: UV-Fluorescence- measuring O2 concentration,
Chemiluminescence- to measure photochemical NOx concentration,
Gas chromatography- to measure green-house gases.
By using Bioassays and Biosensors.
Other technologies: AirBot- for monitoring airborne pollutants; WaterBot- for testing water quality; sensaris- gives instant air quality measurement; electronic Nose- to detect small amounts of hazardous airborne chemicals.