Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Mapping and Monitoring Pollution Levels of Carbon Monoxide (CO) using
  Arduino and Location-Based Service   Air pollution is a serious issue in the world. Around 98% of cities with a
population of over 100,000 people in low and middle-income countries do not
meet air quality standards, while in high-income countries, the number has
decreased by 52%. Industries and motor vehicles are the biggest contributors to
carbon monoxide (CO).Air pollution is a severe issue in the world. The object
of research to investigate is the detection of carbon monoxide (CO) levels in
an area mapped based on the current CO levels along with the location
coordinates via GPS and LBS technology with a microcontroller and sensor-based
device.The results of testing the CO level detection devices found that high CO
levels are in the afternoon with an average CO level of 49.59656 which means
classified as dangerous if we are outdoors more than 30 minutes, can interfere
with heart function.

14
The categories of this paper are: math-ph
6
The categories of this paper are: astro-ph
26
The categories of this paper are: bayes-an
33
The categories of this paper are: plasm-ph
5
The categories of this paper are: gr-qc
16
The categories of this paper are: stat
28
The categories of this paper are: alg-geom
35
The categories of this paper are: mtrl-th
23
The categories of this paper are: solv-int
13
The categories of this paper are: quant-ph
0
The categories of this paper are: hep-ph
10
The categories of this paper are: q-bio
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The categories of this paper are: dg-ga
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The categories of this paper are: patt-sol
32
The categories of this paper are: atom-ph
37
The categories of this paper are: supr-con