Beijing experienced clearer skies during temporary vehicle restrictions ahead of the September 2015 parade. The authorities restricted the city’s 5 million cars to driving on every other day, to celebrate the 70th anniversary of Japan’s WWII defeat on September 3rd.
The measures for the air pollution began in late August, lasted until the day after the parade and photographs showed unusually clear blue skies.
Zhang Dawei, head of the Beijing Municipal Environmental Monitoring Center, told the Beijing Times that “This is unprecedented in the history of PM 2.5 monitoring in Beijing. Between Aug. 20 and Sept. 3, Beijing’s average levels of PM 2.5 were 73.2% lower than the same period in 2014.”
Source: Wordless Tech My Science Academy
A short interval of cleaner air
The comparison quoted by Zhang Dawei concerns average PM2.5 levels between 20 August and 3 September, measured against the same period in 2014. It does not describe a permanent change in Beijing’s air. Alternating driving days restricted which vehicles could be used during the event, rather than removing half the city’s cars altogether. The clear-sky photographs give the episode a visible form, while the dates and pollutant measurement explain the narrower result.
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