The study found that 255 of 293 Indian cities exceeded the WHO’s annual PM2.5 standard by October, while only 37 surpassed the more lenient NAAQS, indicating a need to revise the 2009 national standards to match global health benchmarks
The study found that 255 of 293 Indian cities exceeded the WHO’s annual PM2.5 standard by October, while only 37 surpassed the more lenient NAAQS, indicating a need to revise the 2009 national standards to match global health benchmarks