After more than 16 years, the World Health Organization (WHO) updated its air quality guidelines, including its recommended limits for one of the world’s biggest killers, PM2.5 air pollution. The WHO lowered their annual PM2.5 limit by half, from 10 micrograms to 5 micrograms. So are these new guidelines safe …
PM2.5 AQI (air quality index) is the most common measurement used to track air pollution and air quality. In this article, we will discuss how PM2.5 AQI is calculated, how you can use it, and we’ll uncover its funny quirk. How Is PM2.5 AQI Calculated? To calculate the PM2.5 AQI …
Air pollution is a serious problem in Hong Kong, and Hong Kongers often complain that the worst of it comes from Mainland China. Is that fact or a convenient scapegoat? After all, Hong Kong is a densely populated developed city with one of the busiest ports in the World – …
A user on Quora asked recently how bad the air pollution in Nepal is. Nepal has glorious mountains and shining temples. But how is the air? I checked the World Health Organization’s global PM2.5 database. According to that database, Kathmandu’s PM2.5 particulate pollution averaged 49 micrograms/m3 in 2013: …
