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用大气中的悬浮颗粒物形成的空气污染被称为霾(Smog)。

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Pedestrians wearing masks walk on a road in heavy smog in Harbin city, northeast Chinas Heilongjiang province, 23 November 2013. Municipalities and provinces of east and north China started seeing a new round of smog on Friday after days with no wind. The National Meteorological Center issued a yellow warning on haze at 2pm on Friday (22 November 2013), forecasting medium or serious haze in Beijing, Tianjin, and the provinces of Hebei, Shanxi, Shaanxi, Henan, Shandong, Anhui, Jiangsu and Zhejiang. In east Chinas Zhejiang province, smog lingering from late Thursday left the air quality in the cities of Hangzhou, Huzhou, Jiaxing and Shaoxing at seriously polluted levels, according to the website of provincial environment protection department. According to the provincial weather station, the smog will not disperse until late Saturday, when a cold front with rain is expected to hit the province.
People ride along a street on a smoggy day in Daqing, Heilongjiang province, October 21, 2013. The highest red alert was issued for heavy smog in several cities in Heilongjiang province on Monday, according to Xinhua News Agency. The second day of heavy smog with a PM 2.5 index has forced the closure of schools and highways, exceeding 500 micrograms per cubic meter on Monday morning in downtown Harbin, the provincial capital. REUTERS/Stringer (CHINA - Tags: ENVIRONMENT SOCIETY) CHINA OUT. NO COMMERCIAL OR EDITORIAL SALES IN CHINA
People ride along a street on a smoggy day in Daqing, Heilongjiang province, October 21, 2013. The highest red alert was issued for heavy smog in several cities in Heilongjiang province on Monday, according to Xinhua News Agency. The second day of heavy smog with a PM 2.5 index has forced the closure of schools and highways, exceeding 500 micrograms per cubic meter on Monday morning in downtown Harbin, the provincial capital. REUTERS/Stringer (CHINA - Tags: ENVIRONMENT SOCIETY) CHINA OUT. NO COMMERCIAL OR EDITORIAL SALES IN CHINA
Bildnummer: 60546380 Datum: 30.09.2013 Copyright: imago/Xinhua (130930) -- NANJING, Sept. 30, 2013 (Xinhua) -- Passengers cram the lobby of the Nanjing Railway Station in Nanjing, east China s Jiangsu Province, Sept. 30, 2013. China s railway is expected to carry more than 10 million on the peak day during the coming National Day Holiday, according to the China Railway Corporation. The seven-day National Day Holiday, also called Golden Week, starts on Oct. 1. (Xinhua/Sun Can) (hdt) CHINA-NANJING-HOLIDAY-RAILWAY-TRAVEL PEAK (CN) PUBLICATIONxNOTxINxCHN Gesellschaft Verkehr xsp x0x 2013 quer 60546380 Date 30 09 2013 Copyright Imago XINHUA Nanjing Sept 30 2013 XINHUA Passengers CRAM The Lobby of The Nanjing Railway Station in Nanjing East China S Jiangsu Province Sept 30 2013 China S Railway IS expected to Carry More than 10 Million ON The Peak Day during The Coming National Day Holiday According to The China Railway Corporation The Seven Day National Day Holiday Thus called Golden Week Offs ON OCT 1 XINHUA Sun CAN HDT China Nanjing Holiday Railway Travel Peak CN PUBLICATIONxNOTxINxCHN Society Traffic xsp x0x 2013 horizontal
Motorists drive as haze covers Muar city in Muar, southern Malaysia on June 23, 2013. The thick smog brought on by forest fires in Indonesia has choked parts of southern Malaysia, prompting environment officials to push for an emergency on June 23. AFP PHOTO (Photo credit should read STR/AFP/Getty Images)
Singapur, boomende Wirtschaftsdrehscheibe Asiens. Nur eine grundlegende Ressource ist rar: Wasser ++DW / Roxana Isabel Duerr ++
This picture taken on January 29, 2013 shows a general view of buildings in the heavy smog in Jilin, northeast China's Jilin province. Beijing urged residents to stay indoors on January 30 as emergency measures were rolled out aimed at countering a heavy cloud of smog blanketing the Chinese capital and swathes of the country. CHINA OUT AFP PHOTO (Photo credit should read STR/AFP/Getty Images)
This picture taken on January 12, 2013 shows sun light being reflected in a window of a building in Beijing. Dense smog shrouded Beijing on January 12, with pollution at hazardous levels for a second day and residents advised to stay indoors, state media said. AFP PHOTO / WANG ZHAO (Photo credit should read WANG ZHAO/AFP/Getty Images)
An employee changes a price label at a supermarket in Wuhan, Hubei province March 9, 2012. China's annual inflation cooled sharply to a 20-month low of 3.2 percent in February as food price pressures eased after the Lunar New Year holiday, giving Beijing room to loosen monetary policy if needed. REUTERS/Stringer (CHINA - Tags: BUSINESS FOOD) CHINA OUT. NO COMMERCIAL OR EDITORIAL SALES IN CHINA
A hazy nightview is taken in severe smog in Beijing, China, 12 January 2013. Beijing was hit by its worst smog in almost a year. Exacerbated by heavy fog, the dense, choking smog that had blanketed the capital for the better part of the past fortnight plunged to a new low yesterday morning. Although the capital is often hit by smog in winter, the past two weeks have seen one of the longest stretches of smoggy days in Beijing in years. Pollution readings, including those for the smog-inducing fine particles known as PM2.5, from the local environmental watchdog and the US embassy were well in severely polluted or hazardous levels for most of Thursday night and Friday morning.