Mahir na towsh brahui book written by waheed zaheer
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The document discusses the results of a study on the impact of COVID-19 lockdowns on air pollution. Researchers analyzed data from dozens of countries and found that lockdowns led to an average decline of nearly 30% in nitrogen dioxide levels across major cities. However, they also observed that the reductions in air pollution were temporary and that levels began to rise again as restrictions eased and human activity increased.
