Air Pollution in Bristol for Tue 27 Jun 2017:

LOW
MODERATE
HIGH
VERY HIGH

The overall air pollution in Bristol: value 1 out of 10 (1 = lowest, 10 = highest)D |
 

Frequently asked questions

What does 'ratified' mean

Ratification is a process whereby the "raw" data that is collected from an analyser is checked to ensure its validity. This entails examination of the data to verify that concentrations are not too high or too low, checking of "drift", where an analysers performance can change over time and calibration of the data against traceable standard gases.

Because the ratification is done a month at a time, the most recent data appearing on http://www.bristol.airqualitydata.com are not ratified. The data before the beginning of the current month are ratified. Meteorological data are not subject to the ratification process.

See also:
Please click on a question below to see the answer on the left ...
Pollution glossary
2
Benzene (C6H6)
5
Ozone (O3)
6
PM10
8
Solar radiation
10
Toluene
11
Xylene