Our expert says:
The symptoms you describe are not uncommon in office workers, and some people are especially sensitive to low levels of indoor air pollutants. Unfortunately, such levels usually don't show up on tests, which can be costly. There are various companies that offer air testing services (e.g. SGS www.sgs.co.za). If you can get enough support from colleagues then you may be able to persuade your employers to pay for the service.
The aircon must be serviced regularly - at least once a year, and that is definitely the responsibility of the company you work for.
Please try to take breaks and get out of the building at intervals - its been shown that even inner-city air is generally better than many indoor air environments.
More on aircon: http://www.health24.com/medical/Condition_centres/777-792-1461-1535,75022.asp
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