Karachi saw the biggest rise in PM2.5 concentration among major cities in the world: Report
KARACHI, Dec. 5 (Gwadar Pro)-Karachi saw the biggest rise in PM2.5 concentration among major cities in the world from 2018 to 2021, according to the report “China's 10-Year Path toward Cleaner Air: An Asian Perspective” released last week by Clean Air Asia (CCA), an international NGO that works for better air quality and healthier cities throughout Asia.
2021 PM2.5 average concentration and three-year moving average of PM2.5 concentration drop. Source: Clean Air Asia
The report gives an overview of air quality in Asia, some European countries, and America. Air quality in megacities covered in the analysis has generally improved over the past decade, particularly in East Asia. From 2018 to 2021, of the nine cities that saw their three-year moving average of PM2.5 concentration drop by more than 10 percent, eight were in East Asia, six of them in China. South Asia fared less well, with Karachi and Islamabad ranking among the lowest.
According to the report, nearly half of Asian countries have current air quality not up to local standards, including Pakistan.
Pakistan far exceeds its stipulated limit in terms of PM2.5 annual average concentration. Source: Clean Air Asia
China is improving the fastest in air quality in terms of the population-weighted annual average concentration of PM2.5 between 2012 and 2019, according to the State of Global Air. Also, from 2013 to 2021, the annual average PM2.5 concentration in China decreased by about 56 percent and the average SO2 concentration fell by about 78 percent.
Average SO2 concentration in Pakistan 2011-2019. Source: Clean Air Asia
Average SO2 concentration in China 2011-2019. Source: Clean Air Asia
The report attributes China’s rapid decline in air pollutants to its strict emission standards. Take fuel sulfur content as an example, China reduced the sulfur content of both diesel and gasoline to as low as 10ppm in 2017, bridging the gap with developed countries.
In particular, China’s new energy vehicle (NEV) leads the continent. As the world’s largest NEV seller and owner, China’s NEV annual compound growth rate between 2011 and 2021 reached 91.3 percent, much higher than the global average. Since 2015, China has become the world’s largest NEV market, accounting for half of the global market. Most Asian countries are in the initial stage in the promotion of NEV, but they have put forward medium and long-term development goals, promising broad prospects in terms of automotive energy transformation.
Global sales volume and regional distribution of NEV in 2021. Source: Clean Air Asia