Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Sensor Deployment for Air Pollution Monitoring Using Public
  Transportation System   Air pollution monitoring is a very popular research topic and many monitoring
systems have been developed. In this paper, we formulate the Bus Sensor
Deployment Problem (BSDP) to select the bus routes on which sensors are
deployed, and we use Chemical Reaction Optimization (CRO) to solve BSDP. CRO is
a recently proposed metaheuristic designed to solve a wide range of
optimization problems. Using the real world data, namely Hong Kong Island bus
route data, we perform a series of simulations and the results show that CRO is
capable of solving this optimization problem efficiently.

18
The categories of this paper are: econ
28
The categories of this paper are: alg-geom
9
The categories of this paper are: nlin
26
The categories of this paper are: bayes-an
19
The categories of this paper are: eess
17
The categories of this paper are: q-fin
13
The categories of this paper are: quant-ph
5
The categories of this paper are: gr-qc
21
The categories of this paper are: adap-org
12
The categories of this paper are: nucl-th
6
The categories of this paper are: astro-ph
22
The categories of this paper are: chao-dyn
25
The categories of this paper are: patt-sol
37
The categories of this paper are: supr-con
10
The categories of this paper are: q-bio
11
The categories of this paper are: hep-lat