Guardian: Brief respite from January's recording breaking wet weather caused air pollution problems over eastern England. Cold still nights on the 20th and 21st meant that air pollution built up in towns and cities. In Leeds airborne particle concentrations reached 8 on the government's ten point air quality index. Hull and York experienced similar problems, along with Chesterfield and Nottingham. The same cold nights caused air pollution to reach level 6 across much of London with Brixton Road being a hotspot,...