Why did initial checks in Singapore fail to find odour anomalies?

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Initial Checks in Singapore Did Not Detect Odour Anomalies Due to Low and Safe Levels of Volatile Organic Compounds and Wind Conditions

Initial investigations conducted by the National Environment Agency (NEA) and the Singapore Civil Defence Force (SCDF) within Singapore did not identify any anomalies that could explain the gas-like odour. This was largely because the air monitoring stations subsequently detected only low and safe concentrations of volatile organic compounds (VOCs), and prevailing wind patterns may have contributed to the odour's accumulation in specific areas rather than its source.
Low Levels of Volatile Organic Compounds Detected

The NEA's air monitoring stations recorded the presence of volatile organic compounds (VOCs) in the air, but these were at low and safe levels. VOCs are described as chemical compounds, either human-made or naturally occurring, that easily transition into gases from solids or liquids. The agency noted that the reaction of individuals to VOCs can vary, implying that even low concentrations might be perceived differently by different people.
SCDF Found No Anomalies During Investigation

The SCDF deployed its resources to investigate the odour but reported finding nothing amiss. Their monitoring teams confirmed that they had not detected the presence of any Toxic Industrial Chemicals in the air. Throughout the period of the odour reports, overall air quality levels were found to be well within established safety limits, further indicating no immediate hazardous chemical presence.
Wind Conditions Contributed to Odour Accumulation

The NEA indicated that wind conditions played a role in the perceived odour. From approximately 3pm on Monday, light winds were observed, coupled with some wind convergence over the northern half of Singapore. This meteorological phenomenon could have led to an accumulation of smells in the northern areas of the country, making the odour more noticeable there despite the source being external.

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Why did initial checks in Singapore fail to find odour anomalies?

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