10.2 Air quality

By martin.hilljegerdes |
airTEXT Air Quality Map for Riga

Air quality is a measure of how clean or polluted the air is. Poor air quality, or polluted air, is the result of gas and particle emissions, and chemical reactions that have occurred in the atmosphere. Poor air quality can be caused by natural sources such as volcanic eruptions (see chapter 5), sea spray, lightning and desert dust. But the majority are caused by five types of human activity: household, industry, transportation, agriculture and waste.