Are you wondering what the different colors and numbers below mean?
The numbers are the Air Quality Indexes,
which is based on a scale from 0 (good) to 500 (bad).The colors
correspond to the different health impact categories (good, moderate,
A common question asked is why are nitrogen dioxide (NO2), sulphur dioxide (SO2) and carbon monoxide (CO) concentrations always so low and is measuring them useful?
To highlight the importance of monitoring these substances this article is going to explain where these pollutants come from and how to they affect our health and the environment.
To keep things short this article will just focus on NO2.
It is already several months since the US EPA updated its AQI standard for Ozone 8 hours breakpoints. This is definitely a positive step towards strengthening Air Quality in the USA, since the US EPA Standard was actually among of the least conservative standard for Ozone, compared, for instance, to similar standards in India, China or Hong Kong.