Commonly, we drive with our air-conditioning system set to the recirculation mode, with outside air being blocked from entering the cabin. This method of airflow keeps the cabin cooler, more pleasant scent and reduce the workload of the air-conditioning system.

The air recirculation-mode switch is the one with the car icon and an arrow (with the U representing recirculation). In this Proton Persona example, it is the middle switch.

However, the level of oxygen in the cabin reduces over time, and studies have shown that oxygen levels plummeting to 19.5% is hazardous and can lead to drowsiness and fatigue. As such, we should allow fresh air to enter that cabin to ensure sufficient levels of oxygen.  

But, allowing the outside air into the cabin carries some risk of airborne pathogens and pollutants, as well as the unfortunate foul odour you happened to be driving past. Not everyone is a fan of that durian scent, such as yours truly.

Since July last year, all new Proton models have been equipped with the N95 cabin filter. The key benefit of having the N95 filter is its filtration ability whilst one set that air-conditioning mode to fresh-air intake to replenish the oxygen levels.

The N95 Cabin Filter can remove 95% of particles larger than 0.3 microns and can remove 98% of PM2.5 dust particles. It serves as a barrier against smoke particulates, dust, bacteria and other pollutants for both fresh (outside) and recirculated air in the cabin.

As for the flagship Proton X70, the SUV comes with the Intelligent Air Purification System (IAPS), which is a combination of the N95 filter, HEPA filter and ioniser system.

The air ioniser discharges negative ions to cleanse airborne dust, allergens and even bacteria.  

Meanwhile, further air purification is done via the air cleaner under the front armrest. The High Efficiency Particulate Air (HEPA) filter removes 99.97% of particles and contaminants that are larger than 0.3 microns. Thanks to the fitment of activated carbon, odour, smoke and formaldehyde are removed from the air.

For current Proton owners who want to purchase the new N95 Cabin Filter, it’ll cost RM59 except for the X70 which carries a higher price tag of RM79. Prices exclude labour charges and should be done at authorised service centres, once movement is less restricted or during your prescribed service interval.


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Enjoys studying specifications and understanding features that aid performance as well as the aesthetics of a vehicle. From spreadsheets and proposals for new products to reporting about the finished product and more.