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How to pick a car air purifier? CADR is the key performance indicator. The Clean Air Delivery Rate, or CADR for short, is an indication of the volume of filtered air delivered by an air purifier. CADR is given through a process called the ANSI/AHAM AC-1 standard: (1) The purifier is placed in a testing chamber of a specified size. (2) Before the purifier is activated, the amount of contaminants in the room is measured. (3) The purifier is activated for a period of twenty minutes, during which time the amount of contaminants is periodically re-evaluated. (4) Finally, the reduction in contaminants is compared to their natural rate of decay Why is the purification rate of "99.xx%" not reliable? Just by reading the end result of "99.xx%", you do not know its testing process: (1) the size of the testing chamber (2) the amount of contaminants (3) the working hours of the air purifier In simple words, any air purifier can show a result of "99.99...%" if you put it in a tiny chamber and let it work long enough.

Interesting situation developing in the UK. http://www.theguardian.com/world/2014/jul/29/diesel-drivers-may-face-higher-costs-pollution-battle

The mayor of Paris, Bertrand Delanoe, launched a proposition to the French government to ban old vehicles from the city to improve the air quality and reduce noise pollution. In his proposal, cars over 17-years old would not be allowed in Paris. Trucks and buses more than 18 years old and motorcycles built before 2004 would also be banned. To help poorer residents of Paris to upgrade to newer vehicles, the Socialist Party mayor suggested a "cash-for-clunkers"-type program. If approved, the ban will take effect in the second half of 2014. The proposal is part of a plan to cut air pollution in the city by 30% by 2015 and to turn Paris into a low-emission zone. French officials report about 43,000 annual death caused by poor air quality. Pierre Chasseray, a spokesman for a non-profit organization, commented that only 3% of the vehicles in France are above 17-years old and therefore the impact from the ban would not be great. Other critics say that the plan should focus on cutting down the use of diesel fuels instead. Collectors of vintage and classic vehicles would not be happy with the proposal as well. Other elements of the plan include reducing local speed limits from 80km/h to 70km/h and imposing a tax on heavy vehicles travelling in the city center. The reduction of speed limit does not really make sense to me as most cars would not be travelling at the highest gear ratio at 70km/h, which is no good for fuel efficiency. It seems like the only sensible suggestion is the tax on heavy vehicle.

The Mayor of London, Boris Johnson, has launched a new campaign encouraging Londoners to turn off their engines when their vehicle is stationary for more than a minute. Delivered by the Transport for London (TFL), the campaign urges drivers of all vehicles to switch off their engines when they are parked or when picking up and dropping off people or goods, reducing the amount of unnecessary and harmful exhaust fumes emitted. A study conducted shows that by doing so, CO2 emissions would be reduced by 100 million kg each year. The campaign also highlights the health benefits of reducing pollution levels and that includes preventing and alleviating illnesses such as asthma and heart and lung conditions. In addition, a research revealed that poor air quality contributes to around 4,300 premature deaths in London in a year and affects the quality of life. Some motorists may be concerned that re-starting the engine repeatedly within a short time frame may be detrimental to the vehicle