❖ The report titled ‘Spare the Air 2.0’ compared the air quality to World Health Organization (WHO) guidelines.

❖ The annual average level of PM2.5 is six to seven times higher in six cities, including Chennai.

❖ In Chennai, the monthly average trend indicated that PM2.5 levels are four to seven times higher.

❖ The PM10 levels are up to six times higher than WHO annual guidelines.

❖ The annual average NAAQS standard for PM10 is 60 μg/m³, while the WHO standard is 15 μg/m³.

❖ For PM2.5, the NAAQS standard is 40 μg/m³, compared to the WHO standard of 5 μg/m³.