ONE voice alone may be too weak to bring environmental awareness, but retired film star Cherie Chu Chung Chor-hung believes hers is strong enough to make a difference. Mrs Chu, 35, who starred in about 80 films before retiring in 1991, has been spotting smoky vehicles for the past year in her campaign against air pollution. 'I always put a camera and a little recorder in my car,' she said. 'I report the licence plate, smoke level, location and time. All those elements are extremely important.' So far, she has reported about 40 vehicles to the Environmental Protection Department, mainly buses, minibuses and taxis. A member of Friends of the Earth green group, Mrs Chu has also been saying no to plastic bags and polystyrene boxes. 'I don't know whether my voice is sufficient to make other people aware of the problems with our environment, but I have started to respect this living place myself,' she said. 'I don't use hair spray. I will not buy cosmetics which have been tested on animals. 'And I cannot stand seeing anything which will further damage the ozone level.' The nature-lover began her green education about a decade ago after being appalled by film-makers cutting down trees just so they could take one or two shots on location.