Beijing recorded ‘good' to ‘satisfactory' air quality on three days (3 to 5 December 2015), which has contributed to a lower weekly average of PM 2.5 concentration. This was the result of strong winds that blew over the city on December 2, 2015 and dispersed the smog.
Delhi's air recorded an annual mean PM 2.5 concentration of 153 µg/m³, nearly three times higher than Beijing (56 µg/m³), according to data released by the World Health Organization (WHO) last year.
The WHO data reveal that Delhi has the world's worst air pollution with the highest PM 2.5 concentration levels among cities. Beijing, by comparison, is not even in the top 50 cities by air pollution.
Coming to concentration of PM 10 (particles between 2.5 to 10 µm in diameter), Delhi air recorded ‘severe' rating for one day, ‘very poor' ratings for three days, and ‘poor' and ‘moderate' ratings for one day each.
Beijing, Delhi move to control pollution
The daily PM 2.5 concentration rising to unhealthy levels, i.e. above 150 µg/m³ since December 6, 2015, has prompted Beijing to issue the first-ever “red alert” for pollution. The alert is a pre-emptive measure to protect the city's citizens from a new blanket of smog expected to descend on the city over the coming days.
While schools in Beijing have been urged to close temporarily, odd-even number plate system for cars has been enforced.
The odd-even formula for private cars comes at a time when a similar measure announced by Delhi Chief Minister Arvind Kejriwal is being debated by lawmakers and civil society, with doubts being raised regarding the effectiveness with which the formula can be executed.
“First of all, this is Delhi, where being ill-informed and rich is a virtue. Most people have multiple cars and will just take out their second or third or fourth car—or buy a new one if required—to get around this rule,” Rajyasree Sen wrote in an article in Mint.
It is worth noting here that when the odd-even formula for private cars was enforced in Beijing for a two-week period starting August 20, 2015, the city's usually smog-filled skies had turned perfectly blue.
The pollution level in India's national capital has reached alarming proportions, prompting a bench of Delhi High Court judges to compare the city to a gas chamber last Thursday.
Unlike Beijing, Delhi currently has no formal mechanism for issuing alerts and advisories for pollution, leading the National Green Tribunal to recently issue a directive to warn people about the deteriorating air quality in the capital and suggest ways to deal with it.
Nearly half of the state's 4.4 million school children are growing up into adults with irreversible lung damage, according to a report by the Kolkata-based Chittaranjan National Cancer Institute (CNCI).
(Indiaspend.org is a data-driven, public-interest journalism non-profit)
