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Last weeks wildfire smoke may have drifted through, but the lingering effects when it comes to the current Air Quality Index and the risk of it returning have more people than ever rushing to invest in air purifiers
doi: 10.1136/thorax.58.5.435 Pubmed Abstract CrossRef Google Scholar View reference in article 30
They have all the hallmarks of what could actually make a tube ones favorite
Sociodemographic characteristics We collected data on the participants age, gender, ethnicity (Chinese, Malay, Indian, other), education level categorized as primary (PSLE, no formal qualifications), secondary (O/N level, NTC 3 or equivalent) pre-university (A level, NTC 12 or equivalent, polytechnic or other diploma) or university and above, and monthly household income in SGD ($2000, $2000$5999, $6000$9999, $10000) (SGD: 1000 Singapore dollars about US$750)
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