The source for the above statistic is Euromonitor International.
The data provided by Euromonitor International shows a steady growth in the demand for air purifiers in the USA over the past 10 years. From 2010 to 2020, the sales of air purifiers increased by 238.5%, rising from $1.3 billion to $4.4 billion. This growth was gradual, with the sales increasing each year from 2010 to 2020. In 2010, the sales of air purifiers stood at $1.3 billion, and increased to $1.9 billion in 2011, $2.3 billion in 2012, $2.7 billion in 2013, $3.2 billion in 2014, $3.6 billion in 2015, $4.1 billion in 2016, $4.3 billion in 2017, $4.7 billion in 2018, and $4.9 billion in 2019. This growth can be attributed to the increasing awareness among consumers about the health risks associated with air pollution, as well as the availability of innovative air purifier technology.