In 2021, after 16 years of no changes, the World Health Organization (WHO) presented their new guidelines for air pollution limits. Daily and annual exposure levels for six vehicle pollutants were lowered significantly. WHO decided to update the guidelines after various research provided evidence that toxic air is now the leading cause of premature deaths worldwide. Health impacts are evident even if the exposure is low level. The WHO’s Maria Neira said that the current evidence is stronger than the previous ones. Furthermore, the University of Southampton UK’s Stephen Holgate said that population-based research offers proof that air pollution has no safe levels. Although the WHO air pollution guidelines are not legally binding, they influence governments and campaigners who have lon
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