This was also before the range and weight of pollutants in the air were as great a worry as they are today. (remonline.com)
Levels of harmful pollutants in the air have increased since the coalition government was formed in 2010, despite being in decline prior to that. (politics.co.uk)
Did you know that chemical pollutants in the air inside your home can be 10 to 70 times higher than outdoor air? (retrainingthebrain.com)