和中国这个强大邻居修缮关系对日本没什么坏处。“可持续日本”（Japan for Sustainability）是设在东京的非营利性环保组织。这个组织的代表枝广淳子称：“日本已经在通过技术转让来帮助中国减少污染物排放。但这还远远不够。”
在治理空气污染方面，日本似乎是中国的理想合作伙伴。日本经济团体联合会（Japan Business Federation）自然保护协议会事务局局长岩间芳仁认为，毕竟在20世纪60、70年代，日本出现过同样的环境灾害，而日本解决污染问题的途径是制定新法律，同时采用新技术。岩间芳仁说：“过去我们曾有过同样严重的污染，后来我们解决了这些问题，特别是空气污染，所以我们准备在分享空气污染防治技术方面与中国合作。”
As Japan braces for a Chinese export it never asked for -- toxic clouds of pollution -- it is stepping up its green technology transfers in hopes they will clean the air.
Mending fences with its powerful neighbor wouldn't hurt either. "Japan already helps China to reduce emissions of pollutants through technology transfer," says Junko Edahiro, chief executive of Japan for Sustainability, an environmental NGO in Tokyo. "But there is much more to be done."
Now, with hazardous smog threatening its coast, Japan is offering further tech know-how to an increasingly desperately polluted China. Recently, as part of a mission to improve bilateral relations and avert further aggression over disputed islands claimed by both countries, a new accord was signed that promises to increase sharing of pollution-control technology with China. Tokyo and Beijing have essentially agreed to facilitate technological cooperation in a bid to halt the appalling air pollution that is causing havoc not just in China but in neighboring Korea and southwestern Japan.
China has been slow to adopt measures to control pollution and enforce its clean air act. But increased social unrest in China over its environment has goaded the politburo into action. The recent revelation of so-called cancer villages within China and intolerable levels of city smog have only added to the pressure.
It seems Japan is a perfect partner for China in its bid to clean up. After all, Japan had the same track record of environmental disasters in the 1960s and 1970s, explains Yoshihito Iwama, the environmental bureau director of the Japan Business Federation, known as Keidanren in Japan. Its plight was solved by creating new laws and technologies to deal with pollution. "We have experienced some of the same terrible pollution problems on our past," he says. "And we have overcome such problems, especially those related to air pollution so we are ready to cooperate with China on sharing our anti-air-pollution technology."
He also points out that Japanese factories already operating in China abide by strict environmental controls that could be a showcase for Chinese factory owners.
High on the agenda now is to prevent the disbursement of so-called PM2.5 air pollution -- hazardous airborne particles only 2.5 thousandths of a millimeter across -- that can penetrate deep into human tissue to cause serious health problems. Japan has the technology to help trace the origins of PM2.5 and to predict its disbursement, say Japanese officials.
While both governments iron out the details of the accord, private firms such as Sharp and Panasonic (PC) have been reaping an unexpected windfall selling electronics in China that help purify the air. Sales of Sharp's air purifiers -- which China certifies "remove 99% of PM2.5" -- tripled in January compared with the same month of 2012. "Awareness of health and environment among consumers in China has increased in the past few years, so our air purifiers are selling extremely well there," says a Sharp spokeswoman.
Despite an informal boycott of Japanese goods in China, Kedieran officials insists that trade relations are still excellent between the two countries. Japan has extensive business interests in China and will benefit hugely in the supply chain if China does get serious about detoxing its landscape, say observers.