article_snippet.sent: There is a cold air mass arriving on Thursday night but it is expected to stay dry well into next week.
article_snippet.sent: After the bad smog seen late last week in the South-East, the air will be relatively clear for most parts over the next few days.
article_snippet.sent: But pollution levels will increase again on Thursday and Friday, particularly in the South-West, where Cornwall and Devon are expected to see fumes rise to dangerous levels.