Proper noun
PM2.5
Initialism of particulate matter 2.5, a pollution measurement of particles with a maximum diameter of 2.5 µm.
According to IQAir, "cities in India, on average, exceed the WHO target for annual PM2.5 exposure by 500%." Source: Internet
“As a matter of urgency the Government should adopt WHO’s stricter guidelines around PM2.5 emissions. Source: Internet
NOx reductions due to the NOx Budget Trading Program have led to improvements in ozone and PM2.5, saving an estimated 580 to 1,800 lives in 2008. Source: Internet
Nevertheless, that PM2.5 level is still more than four times the World Health Organization’s guideline of 10 micrograms per cubic metre of air. Source: Internet
Researchers found that every additional 3 micrograms per cubic meters of PM2.5 was associated with relatively minimal, but still notable drops in bone mineral density in the spine and hip. Source: Internet
However, he doesn’t have the powers to tackle all the sources of PM2.5 pollution – from construction to wood-burning to the river. Source: Internet